These Settings will fine tune your systems memory
You need at least 256MB of ram to do this:
Go to Start > Run then type in REGEDIT -and then to the following key:
1.DisablePagingExecutive -Double click it and in the decimal put a 1 - this allows XP to keep data in memory now instead of paging sections of ram to harddrive yeilds faster performance.
2.LargeSystemCache- Double click it and change the decimal to 1 -this allows XP Kernal to Run in memory and improves system performance a lot.
3.IOPageLockLimit - Create a new dword and name it double click it and set the value in hex - 4000 if you have 128MB of ram or set it to 10000 if you have 256MB set it to 40000 if you have more than 512MB of ram -this tweak will speed up your disckcache.