Virtual memory is just a file on your hard disk. When windows runs out of real memory, it starts swapping stuff out to the file (the page file), and swaps it back in as required. This slows the system down somewhat.
However if you are really only running IE, Windows shouldn't need to be swapping out at all, so there is something a bit weird going on here.
The first thing to do is:
Right-click the "My Computer" icon on your desk top and choose "properties" from the menu
Click on the Advanced tab and click the Settings button in the Performance section.
Click the Advanced tab, and then click the Change button near the bottom.
Check that the paging file is set to "System managed size", and if it's not change it, then click set, then OK everything.
If it is already set to system managed, follow these instructions:
Change it to "No paging file" click set, then ok everthing. shut down and restart the computer,
Repeat the above process, this sime setting it back to "System managed size"
(This wipes the original paging file and creates a new one )
If you still experience problems:
Hold down the Ctrl, Alt and Delete keys, and then choose "Task Manager" from the menu that appears.
Go to the Performance tab and look at the section Physical Memory, Total memory should be around 528000, compare it with available memory - you should find that at least half of this is available - if not, then you probably have some nasty stuff going on! post your findings back here