Windows 7 in bootcamp partition- won't start after being fine for year

Hello everyone,
I'm new to this forum and I need help desperately!
I have Windows 7x64 boot camped on my Imac (Snow Leopard)
All is fine on the mac side but the windows side, not so much.
When I boot into windows it starts, the windows logo comes up.
Then the black screen with white cursor (cursor is moveable)
The colored circle spins about 3 times and goes away.
25-30 min later the blue welcome screen comes on.
I will get the 0x80070017 error
Seems as the whole system has gone from 100mph to 1/4 mph
In my memory it seems that the windows side was in the process
of updating (which it seems to do every hour) like 1 of 8 and
don't you dare interrupt. I think I did the unthinkable!
I shut it down and booted back to the mac.
So when I try to boot back to the W7 it looks like it's pay back time.
Iv'e tried safe mode, system restore (which has said it failed while
copying the registry from the restore point, an unspecified error ocured
during system restore)
I do not see any explanation points in my device manager.
Any help to fix this would be so appreciated. Iv'e been working on this a week!
Lowell