Two things for starters, more ram and a larger hard drive. The hard drive option is upgradable but I wouldn't go for something more than 10-20gb if you can find one anywhere. The ram is going to be more of a problem, I bet the system used simms and those are expensive compared to dimms/sdram. If the ram can't be found for cheap, get the hard drive and make a swap partition on it as large as 1.5 - 2 GB. It's more than most folks needs, but with limited memory and if you're going to run KDE, you're going to need the swap space.