To increase the system page file follow the give path:
Control Panel > System > Advanced > Click on Settings (Under Performance) > Advanced > Change
Here under Drive (Volume label), you have option to select any of your hard disk drive, but the best choice is, select any drive other than C drive for virtual memory.
Set the double Initial & Maximum Size of your Virtual Memory. Here set initial size 700 MB and maximum size up to 1000MB; you can change this size according to the free space available on your hard drive.