Hi maxibull and Welcome to The Forum.
STOP 0x0000007A: KERNEL_DATA_INPAGE_ERROR
Usual causes:  Memory, Paging file corruption, File system, Hard drive, Cabling, Virus infection, Improperly seated cards, BIOS, Bad motherboard, Missing Service Pack
Looking through your drivers:
Avira is known to be a cause of BSOD's on some Win 7 systems.
Uninstall Avira  and download BSOD friendly 
Link Removed due to 404 Error as its replacement. Make sure Windows firewall is enabled!
Update your graphics drivers:
  
nVidia Graphics Drivers.
- Download and install Driver Sweeper.
- Uninstall your current Graphics setup through Programs and Features
- Boot to Safe Mode...