I have a dell pc XP professional and when I restart my system it says O S Install mode enabled. Amount of available memory
limited to 256MB. Strike the F1 key to continue. F2 to run the setup utility." windows will start but is not using additional memory that was installed earlier so it is runmning very slow.It has 1280 MB DDR SDRAM. If I disable the OS install mode I get a message that says Windows could not start because the following file is missing or corrupt: System 32\Drivers\pci.sys . Has anyone else ever had this happen and how do i fix it?