To fix the problem (i found this on interlopers)
from interlopers:
To fix this, you create a shortcut to your hammer.exe (in either Ep1 or Orange)
and add this to the end of the Targetpath
CODE: SELECT ALL
-dxlevel 80
Ex: "C:\Program Files\Steam\steamapps\-----x-----\sourcesdk\bin\orangebox\bin\hammer.exe" -dxlevel 80
and heres the result>>
NOTE: you have to start it from this shortcut, starting it from sdk wont work.
(NVM THERE ARE STILL PROBLEMS LIKE MODEL VIWER CRASHES AND STUPH, GO BACK TO EP1)