Corrupted Windows 7 install on W520 need to reinstall Windows?

Somehow I have corrupted my Windows 7 installation on my W520.
I receive this error message from Windows when I try to open standard links with Windows Explorer:
"This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel."
Lenovo Support says I have to reinstall Windows 7 from the recovery disks. (My backup is also corrupted.) I do not want to completely reinstall Windows if I don't absolutely have to (Nobody would.). Fred Langa has a column that says you can do an "upgrade" reinstall to the same version you already have and it will fix a corrupted Window. However, as I don't have a complete copy of Windows I don't know whether I can do that with my Lenovo Windows serial number? I have downloaded a couple of Windows 7 install discs from Digital River and neither of them seemed to work. (I am running Windows 7 x64 Professional.) I have tried a bunch of file association changes by merging new associations with the Registry, but this has not solved my problem. Windows basically works, and all of my programs work, so I am really hoping for a solution. I can use Power Desk to navigate Windows instead of Windows Explorer but it won't open the desktop shorcuts like Control Panel, Documents, Picture, etc.
Any ideas? Thank you!
W520, Intel QM67 Express Chipset, i7-2760QM, 1000M NVIDIA GPU 2GB DDR3, 1920x1080 FHD LED, 16GB Corsair Vengeance PC3 12800, Intel Centrino Ultimate-N 6300, Samsung 840 Pro 256GB SATA 3 SSD, Sony Optiarc BD-5750H Blu-ray Writer, Dual-Mode DisplayPort.

Sorry to be slow in responding, I had a 400-mile drive between receiving your e-mail and time to respons. <ouch>
I have been to Digital River, but I found *two* versions of Windows Professional X64. I also found two different numbered ISOs which claimed to be the same version. (I actually first learned about them in a different forum in Lenovo.) I tried to do a Repair from them and neither worked. They might work for an upgrade install, with my Lenovo serial number, but they do not work with a Repair. (I did have a Repair disc that I had made myself, and it did *not* solve my problem.)
Do you happen to know the exact ISO number of a version that will work. They are 3GB per download, so they take a few minutes at home. Here I am on a satellite connection so I couldn't download them at all.
Thank you very much and you have always been extremely helpful. BTW, are you at all optimistic that I won't have to reinstall Windows. I am pretty fatalistic myself at this point. I have worked on the problem for more than 10 hours.
W520, Intel QM67 Express Chipset, i7-2760QM, 1000M NVIDIA GPU 2GB DDR3, 1920x1080 FHD LED, 16GB Corsair Vengeance PC3 12800, Intel Centrino Ultimate-N 6300, Samsung 840 Pro 256GB SATA 3 SSD, Sony Optiarc BD-5750H Blu-ray Writer, Dual-Mode DisplayPort.

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