Aw man,I’ve been there, and all too recently! The same exact thing happened to me last January. But my failure was on a Solid-State Hard Drive, so don’t feel too bad. It was time to upgrade anyway, but I was in the same boat and didn't know enough about tweaking the system for the best performance. So, the guys at Solid Box got us back up and running in less than 20 minutes. They originally talked us into buying a machine with two hard drives. The first is where we keep all the programs and the second is a large (500GB) drive where we keep all the data. (I can't believe it never occurred to me to separate the program and data files...duh) We’re a small engineering company, so we didn’t have a server. They sold us a fancy NAS drive and configured it so our “data files” get backed up twice every week.
When they sold us the computer we had them install SolidWorks, GibbsCAM, and our 3D scanner software. Not to mention, they made a backup image of the system and placed it on an external drive. When the hard drive failed they sent out a technician and she replaced the hard drive in a few minutes. I called Chris over at Solid Box and he helped me restore my computer in a matter of minutes. Fortunately all the pointers back to my data drive where still intact.
Even if you don't go this route, Chris is a very helpful guy. He talks too fast sometimes but I’ll bet he would give you some advice on how to best re-install and setup everything. It's worth a shot. We actually bought from them because our reseller recommended them and they helped us fix systems that we purchased from somewhere else. I don't usually post on forums, but when I get good customer service, I like to let people know about it. Good luck man...