Okay . . . here's what I think:
You can get a copy of shell.dll from here:
http://www.dll-files.com/dllindex/dll-files.shtml?shell .
Try downloading shell.dll, and placing it in either C:\windows\system or c:\windows\system32 (try one, if that doesn't work, try the other)
I cannot promise this will work, and I cannot promise that this won't break something else.
My Advice is this: If it were my computer, I would try it. However it might break something along the way (but *probably* not)
Let me know how it goes!
-vermonter.