Internet Explorer is randomly deleting my bookmarks

This started about 3 days ago, and I'm not sure how. I've run Spybot, AVG and other programs, but nothing seems to stop it.

Whenever I click on a link in my bookmarks, it gets deleted in the folder almost automatically afterwards.

The bookmarks that get deleted seem to happen at random. When I replaced the bookmarks and clicked them again, sometimes they are fine while others that survived the first round get erased, while some bookmarks remain untouched. This happens to bookmarks in completely different folders, and my history seems to have been left untouched.

Any ideas?

Uh oh. Sounds like a defective hard drive might be the culprit. Go to the HD manufacture's website, download and run what ever drive checker they recommend. Be forewarned that sometimes drive checkers end in BSOD, so backup your important files first.