Your video card is most likely GF6150 (comes with the newer nforce chipset motherboards). It should go up to 128MB shared video memory, but you currently only have 64MB of it - so you might try increasing that. See if there's an option for it in the BIOS. Be warned that, even if it's possible, it might do more harm than good since your main RAM is so low - doing this will deny another 64mb for OS's use.
Your best chance is, as other have noted, to get more RAM and a real video card. Your system should support up to 2GB RAM and it's almost certain that there's a PCI-xpres slot in it (but check to make sure before you buy!).
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