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a good start would be to follow this guide:
http://home.comcast.net/~SupportCD/OptimizeXP.html

then

run > regedit

remove dlls from cache memory

go to hkey_local_machine\software\microsoft\windows\curr entversion\explorer. create a new dword value named alwaysunloaddll, and give it a data value of 1

prefetch parameters
set the registry key hkey_local_machine\system\currentcontrolset\contro l\session manager\memory management\prefetchparameters\enableprefetcher to 0 to disable prefetching, 1 to prefetch application launch files, 2 to prefetch boot files, or 3 to prefetch as many files as possible.

place windows kernel into ram

edit the registry key hkey_local_machine\system\currentcontrolset\contro l\session manager\memory management\disablepagingexecutive to 1 to disable paging and have the kernel run in ram (set the value to 0 to undo this hack). exit the registry and reboot.

enough for now.