Click System and Security and then click System.
In the Computer Name, Domain, and Workgroup Setting section, click Change Settings.
Click the Advanced tab, and then click Settings in the Performance area.
Click the Advanced tab, and then click Change in the Virtual Memory area.
Deselect the Automatically Manage Paging File Size for All Drives option.
From the Drive list, select a hard-disk if you have one to put it on or set the size yourself but its not good to put the pagefile on an SSD.
on a side note, if you have like 16gb or ram you can run without a pagefile. I deleted mine about 2 years ago and havent seen an issue yet.