Hardware

If the files are really Important you should pack up the drive and send to a Data Recovery Specialist as the more you mess with the drive the more damage you can do and the more it will cost you to recover the Data along with the possibility that you may render some or all files impossible to recover.

If the data would just be nice to get back and you can live without if necessary you can try one of these which is a short list of the better programs available

http://tinyurl.com/273ay5

http://tinyurl.com/rmvrv

http://tinyurl.com/yvrsl

http://tinyurl.com/yyk8cm

http://tinyurl.com/382vm

http://tinyurl.com/ynwnel

http://tinyurl.com/nc4kx

http://tinyurl.com/2wox7l

http://tinyurl.com/374d8b

http://tinyurl.com/djw6u

http://tinyurl.com/f73se

http://tinyurl.com/8bd3f

http://tinyurl.com/afu2j

While the last 2 are from the same company they are very different products. Win Hex should only be considered for use by someone who knows Hex Inside Out while Davory is a great cheap General Purpose Application.

Personally I prefer the On Track Option but it's anything but cheap. However because I use this type of software a lot it's paid for itself many times over by now, for a cheaper option Spin Rite from Gibson Research or Stella have both very good reputations by other TR members.

Also try the HDD makers Disc Testing Utility to just confirm that the HDD itself isn't failing.

http://www.tacktech.com/display.cfm?ttid=287

Col

As neither reading is correct. Best to stop booting this drive until it is fixed.

First, download the hard drive vendor's testing utility and run the tests.

If the drive is failing, you are looking at a data recovery route.

If the drive is OK, run a
chkdsk /r
on it while it is slaved to the other system.

You may then need to fix the partition table with a partition editor. Download the UBCD and try scanning with various partition tools to see if one finds the errors and can correct them. This disk also has HDD testing utilities as well, and may have the one for your HDD vendor. http://www.ultimatebootcd.com/

edit:
You may need to run chkdsk /r again after.

If this isn't your cup of tea, you may simply wish to go with data recovery, and I see that OH Smeg has already posted his list while I was typing this.