Losing memory

System Running Win 98 SE loses available ram
while sitting with pipes screensaver running.
Some software will not release all memory when closed, however this system will lose ram just running Windows and the pipes screen ( or any other) saver.
Any ideas on what may be taking up all the free ram space?
Unit is currently running memstatxp and system resouce meter. Both show the same memory leakage.
Board is ASUS TUV4X with 256K ram. ATI video 32 mb.