I downloaded QGIS (for Windows) and installed the software. However, when I start QGIS, I get an error message:

"The Instruction at 0x04c20d55 referenced memory at 0xffffffff. The memory could not be read."

Any ideas how to solve this problem??

  • Please let us know your system and OS Details.I think its might RAM problem..IF possible remove qgis---reboot machine and reinstall software also check system requirement
    – Sunil
    Jan 10, 2013 at 13:06
  • According to the forums.majorgeeks.com/showthread.php?t=121904 link it might DLL file problem and Update the windows.
    – Sunil
    Jan 10, 2013 at 13:15
  • It just might be a dll that installs with Qgis, not a standard Windows dll.
    – AndreJ
    Jan 10, 2013 at 13:30

1 Answer 1


We have a standalone installer for Windows and the OSGeo4W installer. Which one have you used? Try the other one to see if its getting better.

For the standalone installer, install into a path with no blanks, as this causes some problems.

  • Thank you! I just tried the OSGeo4W installer. This time now error messages. Everthing works fine! Regards, Tim
    – user14119
    Jan 11, 2013 at 8:31

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