[Quelty]

For XP

You can increase the size of your page file if there is space available on the hard disk.
Logon as an Admin, hold down the Windows logo key and press Pause/Break to open System Properties.
Click the Advanced Tab.
In the Performance section click Settings.
Click Advanced Tab again.
In Virtual Memory section click Change.
Choose the appropriate drive in the first window. Below that choose Custom Size and increase the value in the Maximum Size(MB) box.
Click set, ok, and then restart your computer.

Cheers

Quelty
EDIT: Googled page file and found this;

Code:

Virtual memory a.k.a. "swap file" "page(ing) file" is:
1- A file on your hard disk,
2- Used by the system (Windows) to store Physical memory (RAM) content when it (Windows) needs to make room for more content.
Therefore, it is:
3- Sensitive to available space on your disk (If your HD is almost full, Windows won't be able to expand that file to the size it needs).
4- Very sensitive to disk fragmentation,(more so if you use the FAT32 format).

So, if you have at least the minimum recommended RAM size for your Windows version, please DO increase the size of your Virtual memory to at least 2.5 times the size of your real RAM (256MB RAM = 640MB or more for virtual memory).

IMPORTANT: Setting the SAME Max. and Min. values to the virtual memory (and doing so after a disk defrag) (Min. size = 640MB AND Max. size = 640MB), will reserve that space for the file (even if your drive fills up, windows will have enough space for it) and, minimise fragmentation of the file, plus a noticeable speedup of startup and shutdown times.