TAKEN AT YOUR OWN RISK
I found this useful app via FixMyXP. ClearMem Is an Excellent Tool for speeding up your XP Computer (especially if your system has been on for awhile and you have a lot of applications open). What it does, is it Forces pages out of physical memory and reduces the size of running processes if working sets to a minimum. When you run this tool, the system pauses because of excessive high-priority activity associated with trimming the working sets. To run this tool, your paging file must be at least as large as physical memory. To Check your Paging File:
1. Go to your control panel, then click on 'System', then go to the 'Advanced' Tab, and Under 'Performance' click 'Settings' then the 'Advanced' Tab
2. On the Bottom you should see 'Virtual Memory' and a value. This is the value that must be at least as large as how much memory is in your system.
3. If the Virtual Memory Value is smaller than your system memory, click Change and change the Min Virtual Memory to a number that is greater than your total system memory, then click 'Set' and Reboot.
4. Once you have rebooted install ClearMem