10.5.2 Uses 100% CPU for about 10 mins

Everything was fine on 10.5.1 but 10.5.2 on Windows 7 32bit seems to use 100% CPU (iTunes.exe) for about 10 mins before settling down. I was just about to post 100% CPU when I saw it was back to normal so I closed and reopened it and the same thing has happened. PC has been restarted since it was installed.
Any idea what is causing this? Can I downgrade - if so, how?
PS: it's actually using 100% of one core.

Check out this Apple article -> iTunes 10.5 for Windows: May see performance issues and blank iTunes Store
If you have one of the LSPs mentioned, you may have to do a winsock reset or remove the conflicting software.

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