>It looks like Firefox folder was deleted/moved. Try to search your harddrive for Firefox.exe in case it was moved.
It gave:
UninstallFirefox.exe C:\WINDOWS
FIREFOX.EXE-28641590.pf C:\WINDOWS\Prefetch
UNINSTALLFIREFOX.EXE-12AAD7CD.pf C:\WINDOWS\Prefetch
I think this one is really gone and that there is nothing I could do but to reinstall it.