Here's our Windows XP Tip for.. July 11, 2005
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Paging File Size
For the best system performance, you should set your paging file to be roughly twice the size of your system RAM size. To check and modify the size of your paging file, right click My Computer and choose Properties. Click on the Advanced tab. Click on the Settings button in the Performance area.

Click on the Advanced Tab. Then, in the Virtual Memory area, take note of the Total paging file size for all drives. It should be about the same size as your system's RAM size. Click the Change button.

Multiply this number by 2 in your head. Find the drive you wish to have the file reside on, and click it. Click the Custom size radio button and make your changes. Remember to put the number you calculated in the initial size field. When you're done, click the Set button; and then click OK until you get back to your desktop.

This change will require a reboot. After your computer restarts, you should be all set.