Hi, may I begin with an apology if I've posted this in the wrong place. Probably many have had this error; following file missing or corrupt: system 32\DRIVERS\pci.sys I am not an experienced pc 'error' user so any simple help would be appreciated. I don't always get this message with reboots just reboots 2 -3 times and then pc is usable. I have Windows XP Home Edt SP 2. I have just run Hijack This and all seems to look ok. Thanking you all in advance for your help.