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#1
Corrupt disk (even after three installs!)
For my Windows 7 installs, after about two days the W7 partition eventually becomes corrupt (see this thread, 3rd post, for similar pictures: Corrupt Disk!!! Help!). No disk check of any kind finds any errors or fixes anything (chkdsk, a few 3rd party disk checking tools).
Oddly enough, my Vista partition has been fine the whole time, and it's survived 3 corrupt Windows 7 installs (and W7 partition wipes).
I've got a laptop running Windows 7 for weeks, but for some reason I cannot keep a W7 installation on my desktop running for more than a few days!