Hmmm...

[ianfreddie07]

Hmmm... indeed. It's pretty mysterious. I wanted to change Nod32 for Avira (better detection rates :D). Unfortunately, when I used Avira, my internet connection vanished. The program wouldn't even update. When I uninstalled it, I tried Avast next, and... The same thing happens. Is there something going on? Help appreciated. Thanks. :amused:

[Scatty]

What firewall are you using?

[Icewolf]

Are you directly connected to the internet (internal or external modem) or are you using a gateway (router with modem or router behind a modem)?

[ianfreddie07]

@Scatty: COMODO Firewall Pro. It was turned off at that time.

@Icewolf: Router behind a modem

[Scatty]

Ok, might be that while you modified the software, Comodo didn't update it's connection settings. Besides, why actually turning off Comodo during AV install? :unsure:
Try to re-install AV with Comodo on and see if that helps.

[_r.u.s.s.]

try system rollback, if it's not too late

[gregor]

There was a version of Comodo which blocked all internet connection instead of monitoring it when some antivirus programmes were on. I am not sure which one that was, but you were suppposed to update it and the new version then worked fine.