I upgraded an Dell Inspiron 3800 from 96MB to 512MB but got PAGE_FAULT_IN_NONPAGED_AREA in ntoskrnl.exe. Antivirus software is disabled (never gets to load anyway), virtual memory has been tried at both twice 512MB and three times 512MB. I have tried one module at a time in both slots. I have also run a chkdsk. The memory is brand new and the correct type for the Inspiron. I'm running W2K sp2.