Invalid digital siganature/publisher

What is the deal with the invalid or unknown publisher/digital signature message with itunes 7.1.1.5!!!!!? I've tried everything in these posts, messed around with the certificate manager in windows,and am about ready to never use itunes again. I never had a problem before itunes 7 and now all of a sudden windows XP or Vista won't download itunes7. Is it Windows or itunes7? And why is this so hard to fix? No one seems to have the answer.

just doublechecking some things. have you worked through the techniques from the following document?
(MS) You cannot install some updates or programs
is Windows Update currently functioning on the affected PCs?
are both PCs on the same network?

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