No boot device, missings system files

System specs:
ASUS P5B Motherboard
P4 3.4 GHZ
2GB RAM
Western Digital WD2500KS 250GB SATA HD
GEFORCE 7600 GS

I have a computer that was at first saying no boot device so I changed a setting in the bios, sata mode i switched from enhanced to compatible. That fixed the problem but I still got the error in compatible mode as well and im in enhanced mode right now and its working fine. Also today i got the error from windows " missing system files c:/windows/system "run repair from xp cd". So I got into windows repair and without doing anything rebooted to look at the error message again to see what file to replace. After reboot i let it try to boot into xp and it did. Another time i rebooted the video was in vga mode and windows said my sound driver software needed to be reinstalled. It seems every time I reboot this machine I get an error message. Is there something I need replace or reconfigure? Thanks.
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More about boot device missings system files
  1. I rebooted again and it was killing and restarting explorer.exe every few seconds or when I tried to do something in one case. It also killed google chrome and didn't restart it. Could it be my CMOS battery?
    kenbb1983 said:
    System specs:
    ASUS P5B Motherboard
    P4 3.4 GHZ
    2GB RAM
    Western Digital WD2500KS 250GB SATA HD
    GEFORCE 7600 GS

    I have a computer that was at first saying no boot device so I changed a setting in the bios, sata mode i switched from enhanced to compatible. That fixed the problem but I still got the error in compatible mode as well and im in enhanced mode right now and its working fine. Also today i got the error from windows " missing system files c:/windows/system "run repair from xp cd". So I got into windows repair and without doing anything rebooted to look at the error message again to see what file to replace. After reboot i let it try to boot into xp and it did. Another time i rebooted the video was in vga mode and windows said my sound driver software needed to be reinstalled. It seems every time I reboot this machine I get an error message. Is there something I need replace or reconfigure? Thanks.
  2. I replaced the CMOS battery and I haven't had any problems since.
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