Mine is 576MB.
Try clicking on the Change button (In Control Panel - System - Advanced tab - Performance Settings - Advanced tab - Virtual memory). A window will open giving you more information. You can click on each drive and it will show you information about the virtual memory file (paging file) on each drive and how much free space you have available for the file.
It is best to keep the paging file where it is, but if you have to (and not having enough free space may be a reason to), its location can be changed here by lowering the size on the drive where it is at and clicking on the Custom size item on a different drive and increasing the size.
Drives that do not have a paging file have the No paging file item checked.
You probably have all of the virtual memory on one drive which is good. And it is probably on the first drive, C, where Windows is. This is also good.
You can experiment with the size by checking the Custom size circle and setting the size in the two textboxes. Put it above the Recommended size by a few MBs. Both settings can be the same number. Both of mine are 576MB and the Recommended size is 574MB. Once you change it, be sure to click on the Set button. You will need to restart the computer for it to activate it.
If that does not help, you can increase it by a couple hundred MB and see if that helps.