Stack Overflow

Everytime when i try to use a gun from counter strike (or any others) i will get a stack overflow, i cannot shoot with anything, everytime i click with a weapon its says stack overflow, also, my camera is glitched to (you know, where to make screenshots with) if i choose it it will look like a normal pistol. i got these errors since i downloaded a zombie weapons pack. help please

Yes, i did delete the pack already, but it didnt work

Uninstall the zombie weapons pack?

i did already, but it still pops up :s