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Calc FAQ

Solutions to Common Problems running with Windows

Q: I can't get Calc to show unless it is maximised - what do I do?

A: You can see Calc in the taskbar, and you can maximize it to see it full screen. But when you "Restore" or try to change the size, it disappears. Really frustrating!

Usually this is because Calc has ended up being located off-screen. This can happen to any application, particularly if you sometimes use a second monitor.

To bring Calc back into view, “Restore” the application, then go to the menu by right clicking the taskbar icon (on Windows 7 you have to hover over the taskbar icon until the preview window pops up, then right click on that) then click on Move, and then hold down the left mouse button and you should be able to move the application back into view. Sometimes this doesn't work, in which case you can also try using the cursor arrow keys, holding the key down if necessary in each direction to try to bring it back into view.

Failing that, as a last resort, go to the Option menu on Calc, click on General and then click on the Factory settings button, then click OK and close down Calc. This is a bit drastic but should get everything back to normal, but you will lose any other settings you have altered.

Q: When I click on Help in the calculator, why is the page not found?

A: This sometimes happens when the calculator executable file is moved, for example to the taskbar, instead of using a shortcut. If it doesn't run the executable from its own directory, it can't always find files such as help and other support files. On Windows, the SETUP.EXE program in the Calc directory can be used to add shortcuts.

Q: Why does my computer freeze up when I am running Calc (or other program)?

A: There are many possible causes of this including device driver problems, damaged registry, faulty RAM or cache or other hardware problems, damaged Windows system files or DLL files, viruses and of course an error in the program itself. Given that Calc has run without difficulty on over a million computers it is most likely that there is some problem specific to your machine. If the program "freezes" or "hangs" you can close it using Ctrl-Alt-Del to bring up the task manager. This will then allow you to find any programs which are shown as "not responding" and close them. They may disappear immediately or there may be a delay of up to thirty seconds before a second confirmation dialog box appears. Often when this happens Windows will continue to be unstable and eventually the task manager itself freezes, or a fatal error occurs (see below). For this reason we recommend making sure that you save all data in any running applications if the system starts to behave in this way. If the problem persists, use the troubleshooting checklist below.

Q: Why does my computer keep crashing with a Fatal Exception error (blue screen)

A: These are usually Fatal Exception 0D (General Protection Fault) and Fatal Exception 0E (Page Fault) and are caused by the hardware detecting an attempt by a program to access memory outside its permitted address space. There are many possible causes of this including device driver problems, damaged registry, faulty RAM or cache or other hardware problems, damaged Windows system files or DLL files, viruses and of course an error in the program itself. Given that Calc has run without difficulty on over a million computers it is most likely that there is some problem specific to your machine. Usually the problems are not restricted to a single application and may occur apparently randomly. You can learn more about Fatal Exceptions at the Microsoft web site. We suggest you follow the troubleshooting steps below, checking to see if the application works after each step.

Q: Why am I getting the message Exception: 0xC0000005?

A: Exception: 0xC0000005 indicates an access violation, in other words the program tried to read or write memory it wasn't supposed to. The details of the actual memory address aren't very helpful. An access violation can be caused by a programming error. But it can also be the result of a hardware error or faulty memory, or the actual error may have occurred in a DLL or other system file. The executable file for Calc could also have been corrupted. But note that unless the file you originally downloaded fails to self-extract, it is very unlikely that the download itself is corrupted. A corrupted data file (default.dat) can also occasionally cause problems. We suggest you try the following in turn, until Calc runs without problems:

  • Reboot your PC (after closing all programs)
  • Delete the "default.dat" file in the Calc folder
  • Delete the "default.dat" and reset to factory settings by clicking Options/Data/Factory Settings button and closing (see above close procedure)
  • Remove the Calc directory and run the original download file to unpack the files and re-install Calc
  • Repeat the step above with a freshly downloaded copy of the software from our web site.

Q: How can I get rid of Windows crashes, hangs and freeze-ups?

A: This is usually not a problem with Calc, but can have a variety of causes. Unfortunately, there is no easy answer to this. The problems are partly due to the diversity of hardware and software used in a typical PC, and also the many constraints, such as backwards compatibility, placed on the designers of the operation system. We suggest the following sequence of troubleshooting checks, running Calc to see if the problem is resolved:

  • Note down the error message
  • Reboot your computer (if necessary by switching it off)
  • Remove Calc as described above and re-install it from the file you downloaded (if the files can be extracted it is very unlikely that there is a problem with the downloaded file)
  • Temporarily disable any running Virus Scanners
  • Check that you have plenty of disk space - run Disk Cleanup if required
  • Check the available system resources (right mouse click on My Computer, Properties tab)
  • Run Scandisk (could be an error on the disk)
  • Try rebooting in Safe Mode (Windows 95 - hold down F8 key while rebooting, Windows 98 and later - CTRL key)
  • Perform a clean boot of your computer using msconfig utility (Windows 98 onwards)
  • Check the Microsoft knowledge base for the specific error
  • Check that motherboard and video drivers are up-to-date
  • If possible, physically swap out memory modules to check for faulty memory chips
  • Disable any external cache in BIOS utility
  • Re-install Windows (backup your data first)
  • As a last resort, reformat the hard disk and re-install Windows (experts only - backup your data and make notes of settings)

Q: Why do I only get the digits before the decimal symbol of the number when I try to paste into Calc from another application?

A: If you are getting this problem and you are using version 5.30 and you are using a character for the decimal separator other than the period (e.g. the comma symbol) then the decimal separator will not be parsed correctly. This problem is fixed in later versions.

Q: Why do I only get the first digit of the number when I try to paste into another application?

A: There is a bug which affects the Unicode version of Calc version 5.3 only. The suggested work-around is to use the non-Unicode version. You only need to run the Unicode version if you are running WindowsNT, 2000 or XP and you are using a non-Latin-1 codepage (e.g. Hebrew, Arabic or Eastern European). The bug is fixed in the version 5.6.

Q: Why do I sometimes get a Windows error after starting in RPN mode?

A: There is a bug which affects Calc version 5.3 on Windows only, when used in RPN mode. If you have values on the stack, close the application and then start it again and immediately use a unary operator (e.g. 1/x) you may get a Windows error. The suggested work-around is to run Calc as a tool tray application (select Options, View tab, Taskbar Tray Icon). This means that after closing Calc it is actually minimised to the tool tray so it does not need to start again next time you use it. The bug is fixed in version 5.6.

Q: How do I un-install Calc from my PC?

A: You can uninstall Calc using the setup.exe application in the installation directory ("/Program Files/Calc" by default). There should also be a link called "uninstall". You can also use the Windows Control Panel and select Add/Remove Programs. You should then be able to select Calc from the list to run the uninstaller.

If you have obtained Calc from an archive which has an older version of the installer, there may not be an automated uninstall option. In this case, simply delete the directory into which you installed Calc (which is usually "/Program Files/Calc"). There is a very small amount of data in the registry, and if you really want to delete it, then first run the calculator and select the Data page of the Options dialog and click on the "Factory Setting" button. Click the "Yes" button in the confirmation message, then quit the application. You can then delete the files as described above. If you created any shortcuts to Calc (e.g. on the desktop or Start Menu), you will need to remove these also.

Q: How do I stop Calc from starting up every time I start the computer?

A: If you configured Calc to start up automatically and now wish to disable this, you can run the setup program again (setup.exe in the Calc directory) and disable it. Alternatively you can manually delete the shortcut from the Startup directory. You can reach the Startup directory by right clicking on the Start button and selecting Open, then go into Programs and then Startup.

Q: Why does Calc sometimes hang, e.g. when I click on the '=' key?

A: A possible cause of problems is if you have a Logitech QuickCam installed. The webcam driver software, and in particular LVPrcInj.dll, attaches itself to other software running on your computer and can cause problems with other applications. A suggested workaround is to go to C:\Program Files\Common Files\Logitech\LVMVFM\ (or use the search feature to find the location of the file) and rename the file LVPrcInj.dll to LVPrcInj.old to prevent it from loading. It may be necessary to reboot the computer in Safe Mode to rename the file if it is in use. After renaming the file and rebooting the affected applications should work again, although some "Video Effects" features of the webcam may be disabled. If this fixes the problem it indicates that this driver is the cause, and it might be worth checking the Logitech website to see if they have an updated driver that fixes the problem.

Q: Why does Calc look funny on Windows Vista?

A: When Calc 5.6 first starts on Windows Vista the menu may run onto two lines (depending on version) and the buttons may be bunched to one side and up against the calculator display. You can correct this by dragging the resize border on the right to make it slightly wider, and possibly extend the border slightly downwards to make the display larger. If you close Calc and restart it the changes should persist.