HI,

The cause is devices such as hard drives or any other high transfer devices being plugged into your other usbs. If you have a external drive run it off firewire or don't use it at the same time you are editing. The best thing to do is to take out all the things you aren't using.

Nick

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Full Specs: 3.2 Pentium 4 Processor, 1Gb RAM 80Gb Root Drive, 120Gb Video Drive + another 160Gb external, Adobe Premiere Pro, Pinnacle liquid edition pro, ati radion 256mb