My old computer struggled with editing SD video. But considering it was an Intel Pentium 4... I can understand that. I picked up a computer last year that is decent. Quad core 4 GB RAM but when I edited HD video... it was ran like a pig and would freeze up. Looked like it was almost maxing out my RAM but each core was around 50%.
The I read somewhere that the video card has a lot to do with how smooth the program runs. Computer has a stock NVIDIA geforce 9200. Would an upgrade make a noticeable difference?