Loading Firefox 8 I get "Firefox8.0.1 is not a valid Win32 application"

Last night I used PCTools to clean up my system. This morning I could not get Firefox to run. (In fact my entire system is running at glacial speed.) I went to IExplorer and downloaded Firefox 8.0.1. When I tried to run the installation I get "Firefox8.0.1 is not a valid Win32 application."

try download a new copy from: http://www.mozilla.org/en-US/firefox/all.html and check it again
thank you

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