Change the size of virtual memory in Windows 7 | Why Should we increase the size of virtual memory?

How to increase the size of virtual memory in MS Windows

If your computer lacks the random access memory (RAM) needed to run a program or operation, Windows uses virtual memory to compensate.   Virtual memory combines your computer’s RAM with temporary space on your hard disk. When RAM runs low, virtual memory moves data from RAM to a space called a paging file. Moving data to and from the paging file frees up RAM so your computer can complete its work.   The more RAM your computer has, the faster your programs will generally run. If a lack of RAM is slowing your computer, you might be tempted to increase virtual memory to compensate. However, your computer can read data from RAM much more quickly than from a hard disk, so adding RAM is a better solution. If you receive warnings that your virtual memory is low, you'll need to increase the minimum size of your paging file. Windows sets the initial minimum size of the paging file equal to the amount of random access memory (RAM) installed on your computer, and the maximum size equal to three times the amount of RAM installed on your computer. If you see warnings at these recommended levels, then increase the minimum and maximum sizes. Open System by clicking the Start button , right-clicking Computer, and then clicking Properties. In the left pane, click Advanced system settings.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation. On the Advanced tab, under Performance, click Settings. Click the Advanced tab, and then, under Virtual memory, click Change. Clear the Automatically manage paging file size for all drives check box. Under Drive [Volume Label], click the drive that contains the paging file you want to change. Click Custom size, type a new size in megabytes in the Initial size (MB) or Maximum size (MB) box, click Set, and then click OK. Note Increases in size usually don't require a restart for the changes to take effect, but if you decrease the size, you'll need to restart your computer. We recommend that you don't disable or delete the paging file. Also Make sure you have enough space on your hard disk.