I have 2 SDRAM modules installed. The first is a 128mb and the second memory module is a 64mb. The 2 modules should equal 192mb, however when the computer starts up or I check how much memory I have installed it says I have 163mb of total system memory. It says 163mb in windows and in the BIOS. I am somehow missing 30mb of ram? I am just curious if anyone knows why? Could a portion of memory modules be damaged. Thanks.