Problem updating itunes to 10.7

Hi im having a problem updating my itunes from 10.6.3.25 to 10.7. Basically if im updating using the the apple software update it finishes downloading and when it gets to verifying the file i get a error message that says ' "ITunes" has an invalid signature. It will not be installed'. Ive also downloaded the file manually from the apple site and when i click on it to install, both normal and run as admin, it doesnt do anything. You see a wee loading bar for literally a second at most and then it disapears. Any help is appreciated thanks.

Mmm... it gets worse.  At about the fifth attempt it appeared to install okay but when I restarted my PC I got the error message
"iTunes was not properly installed.  If you want to import or burn CDs you need to reinstall iTunes."
Running diagnostics suggests there's something wrong with the CD Drive connectivity although it seems to be working okay.
I tried to restore to a previous version, but that seems to have thrown up other error messages.
Guess I'll have to reinstall.  What a pain.

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