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C:\Program Files\Mozilla Firefox>firefox
The system cannot find the file C:\Program Files\Mozilla Firefox\firefox.exe.

C:\Program Files\Mozilla Firefox>dir
 Volume in drive C is ACER
26/10/2010  10:10 PM           912,344 firefox.exe

Tried registry clean then a Firefox reinstall.

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Check registry HKLM\Software\Microsoft\Window NT\Current Version\Image FIle Execution Options\firefox.exe If you find this key, delete it.

It is possible that your computer is/was infected with virus.

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