your guess is as good as mine what i mean 
it came up when i ran belarc advisor , i'll remove it
btw , before the upgrade i used to get a popup from microsoft saying virtual memory to low we will increase it ?
I believe the exact message is something like "Windows - Virtual Memory minimum too low. Windows is increasing the size of your paging file. During this process, memory requests for some applications may be denied." and I think there was a phrase something like "for more information yadda yadda...". In Windows 2000 and NT this was a messagebox. in XP it's a balloon.
Either way, it basically means you are using up too much memory- your "commit charge" is too high, and too much data is being swapped to the pagefile to the point where the specified minimum size is reached. Usually windows manages your memory settings, and as it notes in the dialogue although you might have some programs encounter issues while it increases the size (since some calls to allocate virtual memory may fail). Usually you'll be fine.
Personally, I've only seen this message appear when the machine is either badly infected or has way too little RAM (for example, 96MB of RAM with XP or 512MB with vista seems to do it, or 32MB with 2000... I've run systems like that before and that message was my constant companion.
