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Reason Error: "filename.exe is not a valid Win32 application" when the .exe file association in the registry is corrupt. It is caused by SirCam virus. Solution The solution to the problem Follow the instructions to fix error: "filename.exe is not a valid Win32 application", when trying to run any .exe file: Step 1-Click on ‘Start’ button, and then click on ‘Run’ and type ‘cmd’. Type the following commands one by one:

  1. cd\windows
  2. regedit
Step 2-If Registry Editor opens successfully, then navigate to the following key: 'HKEY_CLASSES_ROOT \ exefile \ shell \ open \ command' Step 3- In the right pane, double-click on the (default) value Step 4-Now, delete all the current value data, and then type: "%1" %* (i.e., quote-percent-one-double quote-space-percent-asterisk.) Step 4-Navigate to: HKEY_CLASSES_ROOT\.exe Step 5-Go to the right-pane and then set (default) to .exe file. Step 6-Exit the ‘Registry Editor’ now. Footnotes: The cause of this is usually a result of the installer not fully downloaded. Because the installer doesn't have a complete file, this error will occur preventing you from installing it.