avast antivirus disables my internet on startup, why?

hello everyone

ive just installed avast antivirus free and when starting my pc, my internet doesnt work, i have to inactivate and then activate it in network settings to get internet to work.

why is this happening?

have vista 64bit…

Hmmm… Which other security program do you have installed? Which firewall?
avast is an antivirus, does not change network/connection settings…

nothing, just free avast and the normal bitdefender already in windows at start…

do you mean you have avast and bitdefender antivirus installed?

pardon me, i wrote wrong, i have windows defender that was already installed…

anyone?

try to unninstall with this tool…run from safe mode and reboot
then install again and reboot

http://www.avast.com/uninstall-utility