After Install Game screws my resolution

So after i downloaded/installed Black Mesa files using the installer AND downloading SDK base 2007&2006 i checked the ‘launch black mesa something something’ option. my screen goes black, my monitor says resolution not supported.

i re-booted my PC, but on normal mode and safe mode they both get resolution not supported Even though i didn’t launch the game. my resolution got altered. So after 2 more futile reboots (just for the fun of it :’( ) i was able to get to my home screen on my PC. In my steam library i see Black Mesa is in there.

I am wondering if anyone else got an issue like this: perhaps i should have just launched the game from steam?

My new problem after the previous event is that when i launch the game through steam the game instant crashes after 3 seconds in main menu screen (Before the blurry screen effect goes away). And sometimes it crashes with…
Problem signature:
Problem Event Name: APPCRASH
Application Name: hl2.exe
Application Version: 0.0.0.0
Application Timestamp: 470c11ae
Fault Module Name: client.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 504ecc4f


AMD 3.2Ghz fx-4100 Processor
Radeon 6800 GPU
16Gb RAM
Windows 7

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.