Can't Open iTunes, installer window appears asking to restart the computer

I have windows Vista-64 bit and I downloaded iTunes 8.0.2. Now once I install the software and use it the first time, it works fine. But after first time whenever I try to open iTunes it takes to the installer window which says "please wait while iTunes configure" and then I get the message "You must restart your system for the configuration changes made to iTunes to take effect. Click Yes to restart now or No if you plan to restart later". If I restart my computer and try to iTunes again, I am again taken to this installer window and the same messages appear. Thus I cannot open Itunes. Unless I uninstall it, and then reinstall it. Then I use it only the first time after installation. But as soon as I exit, i would face the same problem again. Please help

I don't know anything about 64 bit systems and there are differences in the registry. However this problem seems to be due to a problem writing to certain registry keys due to permission issues. HKEYCLASSESROOT\.pcast seems to crop up. this post may help you:
http://discussions.apple.com/message.jspa?messageID=5489263#5489263
But if you use the the event viewer to look at error messages after the problem has occurred you may find the the problem registry key.
If you are running iTunes from a limited user account, temporarily promoting the account might work.
Sometimes you can work round this issue by creating a short cut directly from iTunes.exe. Go to Program Files\iTunes and try starting iTunes.exe. If it opens OK, right click on iTunes.exe and select Send to>>Desktop(Create shortcut). Then use this to open iTunes. It does not fix the underlying problem which is that auto repair is being triggered as the install did not complete fully.

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