After install of 10.0 I get "unable to check for download , unknown error 3603

after I installed ver 10 of Itunes,
I get "unable to check for download , unknown error 3603"
Now I can not get to my downloads at all

Follow these instructions to completely remove Apple software
http://support.apple.com/kb/HT1923
Then use free Ccleaner to repeatly repair your registry until it's fixed.
http://www.piriform.com/ccleaner/download/standard
download iTunes again from Apple.
http://www.apple.com/itunes/
If you have 64bit Vista or Windows 7, look for the seperate download of iTunes for that further down the page.
Once installed, use the Apple Software Update under your Start Menu to fully update all Apple components.
Your content will remain on the drive in the Music > iTunes Folder, nothing is deleted.
You should be making backups of your content regularly, either through iTunes or via copying the iTunesFolder in your Music folder to a external drive.
Windows is notorious for having "other" issues that make it unstable, we as volunteers helping others can't always resolve those issues.

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