Internet Explorer memory usage just keeps expanding

This has been occurring in the past 2 or 3 weeks. With Internet Explorer (7) on, after awhile its memory usage (as seen in Windows Task Manager) just gets larger and larger until it finally locks up, at which time it's not even possible to view Task Manager any more in order to end its process or shut the application. I have to force a shutdown to start using the computer again.
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What is going on here? I didn't seem to have this problem before. Not sure how to fix it.
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Any info or help appreciated.
Thanks
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