Ok im tryin to capture right to divx and when i do its playback is very slow and choppy this is what I been useing

divx 4.12
640x480 rgb
29.97 fps
lock video stream to audio

system specs:
AMD 1.4
win2000
1.5 gig ram
maxtor 160gb hardride
geforce 3 video card

I would like to do it as uncompresed video so i can do the 2-pass with divx and I can resize, but as i was told is 1 minute is about 1 gig, and virtual dub only supports 2 gb files so if I captured a hour long tv show it would be 60 gig and i couldnt compress with virtual dub, so I dont know what to do any suggestions?