On my dell inspiron laptop if I use a live cd to boot into Ubuntu and then reboot into Windows the computer freezes up within 5 minutes. I uninstalled everything that I had put onto my computer since I purchased it (less than a week ago) in desperate measures because I was ready to take it back and play stupid to get a replacement. Once I went on an uninstalling frenzy my problem was fixed, but I had to know if it was from a program I installed or the live cd I used so I tried it again and sure enough, within 5 minutes my computer was unresponsive. I was using usb flash drives for my live cd and this was on a different flash drive than the first. Just thought it should be known, and I'm not doing it again once I fix my less than a week old computer from this again.

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Turns out, I think it was AVG 2011 causing the problem. I had 2 AntiVirus installed and one was paid for (came with the computer) so it wasn't playing nice with the other. It was just a coincidence that when I booted with the live cd that is when I just installed AVG. After uninstalling that it worked perfect.