Unable to boot laptop

System Specs:

Windows XP SP3
Dell Latitude D800

My Hard drive on my laptop says it is missing a hal.dll on boot up.

Also, when I went to do a full windows repair, the C: drive showed up as C: (Unknown).

And to top it off, it will not let me log on as administrator in the recovery console. I used the command LOGON but it thinks for a while then does nothing. The reason I need this is when I went to replace the hal.dll it gave me an “Access Denied” message.

Any Ideas?

Thanks in advance,
-Travis