need help with ram card
 

i got a 256mb ram card and when i put it in it says (system32\drivers\pc.sys) is corrupted or missing. what do i do

It might be a damaged ram you can run this memory diagnostic tool to check what's wrong. Memtest86

you may also want to be sure that the stick you added and any current RAM are of the same type (PC133, PC333, etc) it is not possible to run multiple types at once.