Help! :(

[tntsp1]

Ok, i'm currently running project64 on these specifications.

MS Windows XP Professional SP3
Intel pentium 4 CPU 2.40GHz
639 RAM
and a MOBILITY RADEON 7500C graphics card

I'm having sever slowdown and jerking problems with an game,(Zelda, Paper Mario ) and i've read through the entire instruction booklet turned off everything it mentioned that would likely speed up the Emulator. Yet, still it runs slow, heck i even set windows to lowest graphic quality, Turned off everything(The explorer included!). I don't know if it might be my graphics card. I'm not a very technical person, but since the graphics run fine i doubt it. The speed is just really slow. Anyone have any suggestions on how i could fix this problem?