As the title says... It was working perfectly before, only change is I uninstalled ATI Catalyst as it was causing BSOD's.

Here are details:
Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: hearthranger.exe
Problem Signature 02: 4.2.0.0
Problem Signature 03: 56152078
Problem Signature 04: HearthRanger
Problem Signature 05: 4.2.0.0
Problem Signature 06: 56152078
Problem Signature 07: 2
Problem Signature 08: 57
Problem Signature 09: FatalError
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 9242
Additional Information 1: 176b
Additional Information 2: 176b969a76db020e077b31cb15ab6756
Additional Information 3: ea81
Additional Information 4: ea817ffbe3207b79be2facb4c6e04338

I can provide more info if necessary.

Cheers.

Thanks, used Microsoft .NET repair tool and it's working now.
One more detail, bot started crashing after whole Windows crashed while bot+game were working.