After upgrade to 7, iTunes will not open

I was using iTunes 6 fine until I upgraded to 7 this morning. Now when I try to run iTunes, after I Accept the license agreement I get an error "The iTunes application could not be opened. An unknown error occurred".
I have uninstalled iTunes, deleted the Program Files\iTunes folder, reinstalled iTunes, all to no avail.
Please help.
Don

Try scanning for malware with Ewido http://www.ewido.com then try installing quicktime here (WITHOUT iTUnes) http://www.apple.com/quicktime/download/standalone.html

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