This may be a hardware or software question, but I have a friend who has an older Presario 5461, and it recently was upgraded to Windows 2000. It didn't have enough memory to operate well (Windows 2000 requires quite a bit more than 98 did), so we got a couple of 128 MB sticks to put into it. According to the Compaq/HP website, we got the correct RAM (the size and speed was correct). After installing it, Windows will no longer boot up. It gives the blue screen of death right after the dos-looking progress bar during the bootup process, saying something about an error in NTOSKRNL.dll or something like that. Both sticks give the same result, and putting the original stick back in works fine (but really slowly). Any help with this at all would be very welcome. Thanks in advance.