I cannot launch or reinstall iTunes because of errors 7 and 998.

I recently upgraded to the iTunes 10, and didn't have any problems. Today when I tried to launch iTunes, I was told that iTunes had installed incorrectly - Apple Error #7, Windows Error #998, and that I should re-install iTunes. But when I did reinstall iTunes, I got the same error message. iTunes was working fine yesterday!

Most commonly, an error 7 is either caused by trouble with your Microsoft .NET framework, or problems with one of the applications iTunes needs in order to run (most commonly Apple Application Support, although a damaged QuickTime can cause error 7s too, in my experience).
It seems more likely that your AAS or QuickTime would have "gone off" overnight than your .NET framework. So, let's try a complete uninstall/reinstall of iTunes and all related components and software this time, as per:
[Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP|http://support.apple.com/kb/HT1925]
Does your iTunes start launching again after those measures, AnnLouise?

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