Easy, your computer can't handle it.... Too little ram to run, If XP hogs up to 75-80% of 128mb of ram that leaves virtually nothing for you and your apps. Trying to run XP on that system is like a 600pound man riding a childrens party pony. The poor thing can't handle the burden, also too just go back to 98SE, or even windows 2000 or millenium. That computer must be at least 7 years old, it is seriously XP that is doing that though.
128 mb of ram is just too little for now, an example is that farcry can run on 256 memory but only at 10 fps. Never go by the minimum standard, examine the recommended specifications and use them as a guide rather than the min.
Good Luck with everything!!!
There are only Two things in life i regret doing... 1. Selling my Soul for Cash.... 2. Buying a Compaq.... I should have kept the Cash, huh.