What motherboard do you have. Most newer boards can be populated with one module rather than in pairs as older boards required. This being the case, and you had an available memory slot, you could just add another 64 meg module to bring you up to 256 megs. You would need to find one campatible with your current memory or you might have problems. Another option would be to try and match the 128 and give it the slot occupied by the 64. The 64 would have to go. You'll need to look at the markings on your existing modules to find out what they are and these aren't always clear. Personally, I doubt going from 192 to 256 is worth the trouble.
new to pc i want to install 256 ram at the min i have 192 128 and a 64 what do i need to buy to upgrade to 256.
could i just buy a 256 card???
been reading cnet for months fantastic