If your hard drive is making noises and you cannot boot your computer the odds of getting that data back are very low. That is unless you are willing to pony up some $$$ and have a forensic specialist attempt to recover they data.

If your operating system is just messed up or Windows can no longer recognize the drive, the odds are you can get some if not all of your data back.

For good inexpensive file recovery software go to http://www.runtime.org.

If you want to learn about hard drive forensics go to http://myharddrivedied.com/ and watch the presentations.