http://www.technipages.com/article252.html says:
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iTunes Won't Play Music Under Windows Vista
A solution for when iTunes doesn't play your music after upgrading to Windows Vista.
iTunes doesn't play songs properly under Windows Vista because of the way the software is written to access the registry. You must run iTunes as an administrator.
1. Right click on your iTunes shortcut and select Properties.
2. Click on the Compatibility tab.
3. Check the Run as an Administrator box and click OK.
You can also use the iTunes Repair Tool available at Apple.com
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this will probably fix your error... otherwise you may be up a creek without a paddle:
http://www.tuaw.com/2007/02/01/vista...nice-together/