Updating Podcasts Caused CPU to Max Out ?

Problem : When I hit the 'update all podcasts'my CPU immediately jumps to 100% and stays there until the updates are done.
Why This is Bad : I like to get on with other things while ITunes updates. My PC slows to a crawl.
Is It The Firewall ? : No. I have specifically given ITunes access to the net in Zone Alarm, plus have tried it with both my firewall and antivirus software turned off.
Any ideas ?

Problem : When I hit the 'update all podcasts'my CPU
immediately jumps to 100% and stays there until the
updates are done.
Why This is Bad : I like to get on with other things
while ITunes updates. My PC slows to a crawl.
I have the same problem with podcasts. No problem with playing music or buying from the music store.
Sometimes iTunes crashes when downloading podcasts and browsing the music store at the same time.
What's wrong now?
  Windows XP  

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