I don't know if this will help but I'll carry on, anyway!!!
The computer memory is known as RAM memory (Random Access Memory) and is used to run programs and store temporary data, etc. while running.
If the RAM gets too full then the computer moves what it doesn't really need at that time from the RAM to a Virtual memory on the hard drive.
The Virtual memory should be about 1.5 to 2 times the size of the RAM.
To find these things, RIGHT click on My Computer on Desk top, click PROPERTIES, Click GENERAL tab and note the size of the RAM in MB (at bottom of page).
Now click ADVANCED tab, click settings in PERFORMANCE, click ADVANCED tab.
See section marked Virtual memory, click CHANGE button and make the max to be 1.5 or 2 times the size of the original RAM.
If the Virtual memory is too small it can cause the computer to run slow while it sorts out which data to store and which to remove.
I hope this helps in some way.