Quick steps:
Go to Start > Run.
Type sysdm.cpl and click OK.
In the System Properties dialog box, click the Advanced tab.
Under Performance, click Settings.
In the Performance Options dialog box, click the Advanced tab
go to change under virtual memory
unclick automatically manage paging file size for all drives
click on custom size
inital size should be industry standard is one and a half times your system RAM (in Windows it's measured and set in MB.) For me i would be 8 x 1024 x 1.5 = 12288MB. Use that as the initial size and make the maximum size a few GB higher - say 14336.
Happy Mining