Open System by clicking the Start button 
, right-clicking Computer, and then clicking Properties.
In the left pane, click
Advanced system settings.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
On the Advanced tab, under Performance, click Settings.
Click the Advanced tab, and then, under Virtual memory, click Change.
Clear the Automatically manage paging file size for all drives check box.
Under Drive [Volume Label], click the drive that contains the paging file you want to change.
Click Custom size, type a new size in megabytes in the Initial size (MB) or Maximum size (MB) box, click Set, and then click OK
