Often times the problem with a non-booting hard drive is limited to the outer edge of the platters holding the magnetic material... The boot and startup code is found on the first 18 sectors... usually less.
There are some drives where the bearings fail. Others where the plate break... or crack. Those are very difficult to rescue data.
But the others have very high success rates.
Part of our computer business is in the rescue of data... and we are successful in 87 percent of all drives delivered to us for recovery.
What works for most people should work for you. Obtain a Powered USB in closure. Install the defective drive in the enclosure. Be sure you can read the drive when it is plugged into a computer with a working Windows drive with enough space to hold the data you need to save.
Plug the external power source (adapter) into the wall and the power end into the enclosure.
You can buy these external enclosures at
www.directron.com,
www.newegg.com,
www.frys.com,
www.zipzoomfly.com,
www.outpost.com and many other sites.
Now keep a large notebook to make notes, then create a large number of empty folders that you have named in some way so you can go back to them later.
Then begin dragging and dropping the files, images, etcetera from the defective drive to the working drive in those folders you have created.
Then when you have moved copies of enough to test, go to those folders and be sure they are readable. If they are, as is usually the case, unless they are damaged, you can continue to save files until you get them all.
If you need to save your email of Outlook Express or Outlook, you need to carefully study where those files might be on the defective drive... this is usually the most difficult part of the rescue.
Now burn all those rescued files to DVD disks or other drives. You want to be sure you have extra copies so you have adequate duplicates. You do not know how long the old, bad drive will last.
Once done, immediately check all the files using a good computer... once you have verified you have rescued the needed files, you can begin to breath a sigh of relief... but do not relax until that work of verification is done.
Good luck.