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After Firefox 6.0.1 update, when I try to start I get windows error "firefox.exe is not a valid win 32 application. I can get it to start again if Restore system win7 64 bit. But if I shut FF down it will not start, I get same error message.

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I started my computer this morning all ok, after starting FF it kicked in to an update 6.0.1. Once I completed work, shut down computer. Returned to computer and started up attempted to start FF and got the above error message. As I stated in the question I can get it to start by carrying out a system restore, back to a previous day. Once restore is complete I start FF, but if I shut the computer down FF will not start and above error message is put up by windows. I have also installed FF 4 but have the same issues