Management -at least 512MB of ram recommended

go to start\run\regedit -and then to the following key

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management

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 Kernel to Run in memory  
improves system performance alot

Reboot and watch your system fly ..happy tweakin