How can I mount / fix my Windows 7 partition?

So a while ago my Win 7 partition was "unmounted" and it wouldnt show up in my Finder. When I tried mounting it in Disk Utility it would never work. I would click Mount, and it would't do anything. I wasn't really bothered by it since the partition would still show up when I booted and held 'alt'. I could boot Windows fine.
I was experiencing some problems with my Mac so I figured I'd reinstall the OS. After I did however, the Win 7 partition didnt show up in the 'alt' boot menu. In Disk Utility, the partition still exists, and I still can't mount it. I honestly have no clue what to do, other than to start over again. I REALLY dont want to do that, becuase I have a lot of data on my Win partition.
So im asking how the flip do i fix this...
Any help is, obviously, very apprechiated.

I think you missed my point. Something you've already done has resulted in corruption of the boot loader or boot block making it impossible for you to now boot from your Windows system via your original Boot Camp installation. Reformatting the Windows partition will just remove everything already installed on it, so that would not sound like a good solution for you.
It may be possible to recover the Windows volume using CampTune, but I don't know that myself. I've not used it. The other possibility is to install a new boot loader:
Boot Runner
The rEFInd Boot Manager - Roderick Smith

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