Worked fine last night

Wake up try load and get this?

Problem signature:
Problem Event Name: BEX
Application Name: mumble.exe
Application Version: 1.2.4.0
Application Timestamp: 51aa6593
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Offset: 03962454
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 2057
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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Drivers are upto date ive just reformatted last night and was working when i was playing RUST
now it wont load

help thanks