RAM Boosters and such software doesn't actually work that effectively, and will cause more problems than it fixes. They work by compressing data sent to the RAM and uncompressing it when it's requested. Obviously, this places a greater load on the system processor, and though you gain a perhaps 10-15% net increase in available memory, (you've used some of it for the RAM booster software remember), you've increased your processor load by 30-200%...!
You never get something for nothing, and right now real RAM is cheap.
For £35UKP you can buy a RAM booster software product, but for under £50UKP you can buy 128MB RAM. I know where my cash'd be going...!
Aq