Sorry to say this but: GTFO.
You probably know nothing about VB. You might be able to make a messagebox application, I'm not sure about this though. It is extremely hard to do an aimbot in VB. You are asking straight for a WHOLE source code.
1. Learn VB
2. Use proper English when posting
3. You may ask a question and not beg for a whole source code
And if you are talking about an aimbot for modern warfare 2, there is this one address to do this. Probably a common 4-byte address. So you can simply modify it. That aimbot will only affect the host though. Furthermore, SUCH 4-byte aimbot is probably only available in modern warfare 2 lmao...I posted a source on how to write to memory/nop in the mw2 source code section. The only thing you need to do is find that address and find out what to change. Do not beg for source codes.... -.-