BSOD error 0x00000050

Hello, need som help with BSOD. Its happening random.

System:
Windows 7 Ultimate x64
Processor Amd FX 8120
8GB Ram
Motherboard GA-990FXA
Video Card AMD Radeon HD 6900 1024MB

Thanks for any help

Welcome
You have given us only one dump file. It gives as the cause of the BSODs
VirtDiskBus64.sys
I would make a system restore point, remove or replace the software and test the computer. If it is ok, post so that we know. If not, give us the new BSOD reports.
virtdiskbus64.sys - What is the virtdiskbus64.sys ?

One report is usually not enought to make a definitive analysis.