Resolved Windows Media Centre Guide: Error on starting WMC

I am having trouble when I "open" the guide as it comes up with an error and I have to restart WMC.
I have tried so many things to correct this problem but so far nothing has worked.
Before reinstalling Win 7 as a last resort can someone please tell me the guide's file name and location so I can try deleting it to see if WMC creates a new, uncorrupted copy?

Thanks

 

The error message is:
Description:
Stopped working

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: ehshell.exe
Problem Signature 02: 6.1.7600.16385
Problem Signature 03: 4a5bccdc
Problem Signature 04: mscorlib
Problem Signature 05: 2.0.0.0
Problem Signature 06: 4ef6c7cc
Problem Signature 07: 41c6
Problem Signature 08: a3
Problem Signature 09: System.ApplicationException
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 3081
At this point I have two options:
Check online for a solution to the problem and try to restart the program -
The two choices:
Check online for a solution and restart the program or
Restart the program.

Also, the error occurs while all firewalls are turned off.

If "run the guide setup again" means download the guide again, I have tried that many times. Otherwise I don't know how to "run the guide setup ".

 

Thanks for that - I followed the link and it corrected the problem