There shouldn't be anything needed for the 2 monitor setup to go to one monitor.
To check out your hard drive, you can download a diagnostic utility from the hard drive manufacturer's website. There's a list of the most common one's here: http://www.bleepingcomputer.com/forums/t/28744/hard-drive-installation-and-diagnostic-tools/
To check your file system, go to Start...Run...and type in "cmd.exe" (without the quotes) and press Enter
Then type "chkdsk" in the black window that opens up - and then press Enter.
If it shows errors, then type in "chkdsk /r" (without the quotes) and press Enter - it'll fix the errors this time.
To rebuild the MBR and Boot Sector you'll have to boot into the Recovery Console and execute a couple of commands. There's no need to do this if the computer is booting into Windows - so I wouldn't mess with it unless you're unable to get into Windows.
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