Frame skipping in vegas? Fix?

When im watching the preview in sony vegas it s**** alot of frames at a time, which makes it not run smoothly... its really hard to work with because i dont know if anything looks good til the finished project. Also it only happens when i put Magic bullet colors in the clip, it works completely fine until then (ive tryed downloading new MBL many times, thats not the problem)

Theres probably a million things that could be wrong, but i think it may have to do with RAM or my graphic card?

I currently have 1022 MB of RAM, so any ideas how to fix it or what i need?

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