My Program keeps crashing!!

[Arrow_Raider]

I'm making a cad program now with directx 7(oh joy ). It is a windowed program and ever since i added a z-buffer it sometimes will just crash its self and VB. Well now actually it runs in fullscreen, but i didn't make the border stlye none, so it stil looks windowed. And i had to put a picture box up in the corner or it would crash when you just went to run it... ( )

[Arrow_Raider]

I just tried removing the menus and puting the style to none. It still keeps crashing. I copied the code from a different program that i had, it never crashed, but now on this one it does.

Directx...