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 to complete its work.

The more RAM your computer has, the faster your programs will generally run. It might sound tempting to increase virtual memory if a lack of RAM is slowing your computer, but your computer can read data from RAM much more quickly than from a hard disk, so adding RAM is the best solution.

Also, make sure your hard disk isn't full