AVR-Chat

I'm very familiar with visual basic 6.0.  I need to create an
application that will allow me to manipulate a simple line graph, and
to get specified points off it (to feed to an AVR... i.e. for like a
LED brightness slope... if you see 1V (x) in A-D input here, put (y)
PWM to the LED) and I need to transmit this via serial to the AVR.

Is VB a good choice? Is visual C++ any better? I do NOT want people to
have to download anything, it should be a self contained
install/program.  (I've heard of the .Net platform which apparently
requiers users to download some support file package)  Thanks,

Ryan