If while working on your Windows 7 or Vista PC, you often get the message Your system is running low on virtual memory, then you may want to try this.
When there are too many programs open, like say, like Word or PowerPoint and when your computer feels the shortage of RAM or Random Access Memory, then your PC uses space called as the Virtual Memory. When virtual memory starts running out, you may find your programs taking, like forever to open, close or perform.
To resolve this issue, esp if it is a frequent occurrence, you might want to consider increasing your RAM.
Alternatively, you can also increase the virtual memory size on your PC.
To do so, Click Start > Control Panel > System. In left panel, click Advanced system settings. Next, in System Properties box, select Advanced tab and under Performance, click Settings.
Again here, in Performance Options box, click the Advanced tab, and then, under Virtual memory and then select Change.
Now, un-check the check-box : Automatically manage paging file size for all drives
Select the drive (system drive) that contains the paging file and click on Custom size.
Here you may either choose and type a new size in the Initial size (MB) or you may choose Maximum size (MB) box, click Set > OK. Close all earlier boxes by clicking Apply > OK, where required.