Check the fan on the vid card. I had the same problems with my GeForce 4 the past few days. Was playing Need for Speed Rice and th video would lock up after about 10-15 mins and I would have to reboot. I also started having lines scrolling horizontally. I took the card out and almost burned my fingerprints off. Fan wasn't working properly and cooling thus overheating the card. I blew out all the dust and spun the fan a few times with my fingers and reinstalled and havnt had anymore problems yet.
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"Everyone thinks of changing the world, but no one thinks of changing himself." -- Tolstoy
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