Follow these steps:
In Windows XP
1.Click Start, and then click Control Panel.
2.Click Performance and Maintenance, and then click System.
3.On the Advanced tab, under Performance, click Settings.
4.On the Advanced tab, under Virtual memory, click Change.
5.Under Drive [Volume Label], click the drive that contains the paging file that you want to change.
6.Under Paging file size for selected drive, click to Custom size check box. You can enter the amount of memory you would like to reserve for Virtual memory by entering the initial and maximum size.
7.Click Set
When you are prompted to restart the computer, click Yes.
Special Note: You should choose the same amount for the initial size and maximum size. This will Stop your CPU from constantly changing the paging file.
HOT TIP: To stop your CPU from constantly changing the paging file, set the initial and maximum size to the same value. For example, 500 and 500. The value should be at least 1.5 times more than your physical RAM. If your computer has 512MB of RAM increase the virtual memory paging file to 1.5*512= 768
In Vista
1. Click Start button Picture of the Start button
2. Click Control Panel
3. Choose System and Maintenance and then click System.
4. In the left pane, click Advanced system settings.
5.On the Advanced tab, under Performance, click Settings.
6. Click the Advanced tab, and then, under Virtual memory, choose Change.
7. Click Custom to change the Initial size (MB) and Maximum size. See the hot tip above.