In Control Panel/System/Performance, select File System and the CD-ROM tab. Move the supplemental Cache Size slider to the right to allocate more RAM for caching data from the CD-ROM drive, or to the left to allocate less. Multimedia programs perform better with a smaller cache because they seldom reuse data. For reading continuous data, such as AVI files, use a higher setting for Optimize Access Pattern.For reading random data, increase the Supplemental Cache Size and decrease the Optimize Access Pattern.

Some of still use win 98se :P