This might help: http://www.frugalsworld.com/tweaking/vcache.shtml


VCache is a read ahead file cache designed to speed up Windows file handling. Because Windows will by default assign all available ram to be used as a potential cache it is very important to tweak it. Many people say that there is no need to tweak VCACHE on Win98 or ME but this simply isn't true.
Other sites of interest:

http://www.activewin.com/tips/speed_tips_3.shtml

http://tweakhomepc.virtualave.net/ram/vcache98.html

http://www.putergeek.com/vcache/