Hello This is my first post having found your forum via google. This afternoon my HP Pavilion DV8000 running XP home sp2 stopped responding, only way out in the end was to go to battery power and hold down power switch to shut down. When I tried to reboot instead of running up windows as normal I got this error message Windows could not start because the following file is missing or corrupt<windows root>\system32\ntoskrnl.exe From the handbook and web I found that I needed to repair the operating system with the XP CD. But before the Welcome to setup page was displayed another error screen came up this time acpi.sys page_fault_in_nompaged_area acpi.sys-address FF77AA045 based at F778B000, datestamp 41107d27 Try again, if you still get this message have you just installed any software or hard ware. I tries three time at still keep getting this error. I have not put in any software or hardware for a few months. I do have some of the files backed up but ilke most people not all. This is my main pc I just hope that this old one lasts to receive any help from you. many thanks in advance.