I re installed my PC with Windows 7 64-bit and now have 4.78GB usable memory. I downloaded Movie studio HD 10 and tried making and rendering a video, and it was still slow (but a bit faster than before), so came to the conclusion that it could be my video settings were too high for my computer to render the video. I’ll test it again using different settings (I was using double NTSC 59.9fps, 1080p, best quality video 1440×1080, 8Mbps) and that could be it try 30.00fps or 29.9fps and see if that makes any difference.