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Firefox Setup 7.0.exe won't open in XP-ProSP3; Why?

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I have a fresh (reinstalled after formatting harddrive) XP-Pro installation with SP3. I started rebuilding my system after doing the system installations last night. I rebooted before running Setup 7.0. I have no other information but the error message that came up on the screen. It is:

Firefox Setup 7.0.exe is not a valid Win32 application.

I have a fresh (reinstalled after formatting harddrive) XP-Pro installation with SP3. I started rebuilding my system after doing the system installations last night. I rebooted before running Setup 7.0. I have no other information but the error message that came up on the screen. It is: Firefox Setup 7.0.exe is not a valid Win32 application.

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That error is displayed when the download is corrupt. You should be able to redownload to fix this and if that doesn't work empty the cache of the program you are using to download Firefox with before trying to download again.