Assuming Your using Windows operating system. Windows determines how much hard disk space to allocate to virtual memory. The good news is that you can make your system faster by manually altering your Virtual Memory settings.

Follow these steps to get a noticeably faster PC:

1. Right click on My Computer and select Properties from the drop-down menu. Then switch to the performance tab and select Virtual Memory.
2. Next, make sure the Let me specify my own virtual memory settings is selected.
3. From the Hard-Disk drop down list select your fastest hard disk if you have more than one.
4. Finally, make sure the Maximum & Minimum numbers are the same. To get the optimum number, multiply your system RAM by 2.5 and then put that number for the Maximum and Minimum tabs. For example, if you have 64MB of Ram, your Maximum and Minimum would be 160.

It's always a good idea to install the max amount of memory Your system can handle (especially under Windows XP and higher).