Memory leaks are usually due to bad software, and your running a good OS, so it is highly unlikely . . . . . the swap file is a file that the OS uses whenever it needs extra memory that is not available in RAM. If the size of the swap file is to small, that could cause preblems. The swap file settings would be somewhere in your computer settings.

I don't know if you can look at your "processes" with XP, but in windows 2000, if you do a control Alt delete, you can look and see what is running and how much memory it is using. For XP, if you don't have that capability, you may be able to find a utility on the internet that can do that. You may also want to do a complete virus scan with an updated virus program.