Can you change NMM's various pointers manually? Help!

[hal900x]

So here's the story: after weeks of meticulously crafting the perfect modded FO3, I had my secondary hard drive where it was installed crash. I still had my primary drive though. The NMM executable during FO3 was installed on the primary drive, but I had redirected the other NMM folders such as "Mods" to the secondary drive that failed. Along came FO4. I reinstalled NMM for that reason. I am not sure whether I uninstalled the old NMM first...I don't think so...although the install process may have automatically uninstalled the old version first(?) I installed the NMM executable to the same default folder on the primary drive as it was during FO3. NMM came up with the search dialog for supported games, I think I cancelled it, and from that point on every time I tried to run it I get an error "NMM is not set up to work with Fallout 3, rescan from the change games toolbar" or something to that effect. Which I cannot do, because upon closing that message the program simply exits. So I said screw it, and installed a minimal number of mods for FO4 manually.

 

Now I'm done with FO4 and thirsting to go back to my perfectly, meticulously modded FO3 that took me a month of selecting and testing just the right mods, manually fixing load orders, getting just the right cooperation patches, running repairs, setting executable launch orders and so on till infinitiy. Fortunately I was able to restore the failed hard drive, where FO3 and the old subfolders for NMM exist. I do NOT want to have to start from scratch.

 

So how best to proceed, in hopes of avoiding rescanning everything and redoing all my very hard work? Since NMM will not even load, is there a file I can edit somewhere to restore it to how it was? Can I fix the various pointers and indexes that were there before? Are they stored in the Registry, a DLL, XML file or what? And, I am not even sure why it won't get past this error dialog screen in the first place.