Crashing every 5 minutes

I am editing a feature length HD film in PP CS3 and the software crashes literally every 5 minutes. (..has encountered a serious error and must close…) The crashing mainly seems to occur when I am dragging clips along the timeline.

I read in the faq that turning off hyperthreading helps but I have a AMD Athlon 64 dual cpu and I don’t believe it supports hyperthreading in the first place.

It also said to try to set the affinity of PP to use only one cpu. That seemed to help with crashing but performance is too slow; playback is real jerky.

Any suggestions??

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