Well trying google with the info you provided your system pre dates 1993 am I wrong if not your using a 32 bit os so the added mem will not show up or be used in the system even tho its there like with win xp my older system had 4 gigs of ram 1x4 but it only showed 3.25 its a windows thing now if I installed win 7 it would shot all 4 gigs even tho win xp is 32 and 64 bit ..hope this helps