I have an older PC (and I'm not too techno), but it has two slots where I have 32M 168Pin memory. There are also 4 open slots (smaller pin count), but I'm not sure what they are used for. Any ideas? I want to update the memory to 128, but if I can add some 32's to those four open slots, than it would be cheaper to buy two 32's, than buying two new 64's and removing my existing 32's. I know I should go and buy 512 and blah blah blah, but I have two toddlers who suck my money out of me so we can have Barney and Teletubbies. I'm guessing that the memory probably can't be mixed (meaning the pin count must wither be 168 or the smaller count). Any help would be appreciated..........