Generally pc with little ram is much likely to have alot of lagging and freezing while playing high graphics games or running lot of program at the sametime, Back in those days, we buy a new ram stick to improve our pc performance, but now you can increase your pc ram without the need to buy a new ram stick
The very way to improve your pc performance at no cost is with the use of a virtual ram,
What virtual ram does is to create a space from the hard disk so the system can utilise the created space as ram, giving you the ability to run as much program as you want.
The link to download the virtual ram

http://www.datafilehost.com/d/4c9e761f

How to configure the virtual ram
After installation
Goto setting, click enable virtual
Then enable size partition
Now create the size of ram of want, maximum is 4gb
After creating, click resize hard disk
Wait for the process to be completed
Then reboot your pc
Now you have extended your pc ram by the amount of size you created