How to block a program from connecting to the internet?

[Kilser]

Topic name is self explanatory. How to do.
I have windows 7.

[Ad Bot]

[._maxwell23461_.]

Dunno
Rmove from startup applications?

[james4115]

remove the program from the allowed programs list in windows firewall

[Electrk]

ZoneAlarm

[Raeyok]

There are many ways to do this. It depends on what security software you're using and / or if you're using Windows Firewall.