I recently installed XP Pro onto my comp, and added a 2nd hard drive, and upgraded my RAM. The computer started crashing everytime I'd run virus scan, and on and off when I do other operations, usually when trying to access my 2nd hard drive. The event viewer says that ACPI BIOS is attempting to read from an illegal port address which can lead to system instability blah blah. I looked online and there were a number of different solutions and I am not sure which one to follow. I won't list them here as there are a couple of diff. options--I just wanted to know if you guys had some input on what I should do to fix this problem.