There's a couple of ways. click on START / settings/ "control panel", then choose internet options and choose "delete files" somewhere in the middle. Check delete offline content too, delete your history and cookies while you are at it.
You can also do it when in your browser, menu at top TOOLS/Internet options, same thing.
Oh, and you should delete your cache files regularily if you haven't. No sense saving the internet on your hard drive.
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