screen is messed up

i just bought a hp mini 110-1032nr

I installed Gmod onto it and when I launch it it loads to the blue bar then crashes to my desktop

i put -dxlevel 8 and it runs now but now the menu has black lines going from left to right

is there something i can do to stop this

Isn’t it -dxlevel 80?

what would be the difference

NVM: no i tried it that doesnt work