For the best performance, you should set the initial paging file size to 12MB more than your system RAM. To check or modify the paging file settings, right-click My Computer and choose Properties. When the System dialog box opens, click the Performance tab, click Virtual Memory, then Change to check your current settings. If the initial setting isn’t the desired RAM + 12MB, select the drive on which you want the paging file to appear (or the one it’s currently on) and type in Initial and Maximum settings. This should be RAM + 12MB for Initial and more, if you like, for Maximum (watch that hard disk space though). Now click Set and then click Close to close the dialog box and record your change.

You’ll have to restart your computer for the changes to take effect.