Windows Explorer Shuts down

Recently, every attempt to use windows explorer results in
the program staying active for about 7 to 10 seconds and
then it prompts me with unknown error message and shuts
it down every time. Also, when I try to run scangreg, I
see the path in the MSDOS executable window
as "scanregW.exe". I don't know what that W is there for
and it will not run at all. Any body know of a worm or
bot that is not being detected by Symantec or Spyhunter?
I have done all that I know to do without actually going
to the point of reinstalling the system.

I appreciate any advice regarding this matter.