HELP PLS no internet connection, no avast ERROR 74.86.125.43:80

[Pia]

I purchased Avast Internet Security 5.3
Every time I install it says:
Cannot connect to download927.avast.com (74.86.125.43:80)
I've tried over 10 times!!!!!!!!!!
Furthermore..when avast says everything´s fine, It doesn't let me connect to the internet. Web Lock is set to OFF and Avast says I am connected to the internet but there's NO single way I can browse
So I paid and have to protection at all because I need to work connected.
I use Windows 7 64 bits

Please can anybody help me, please?

[DavidR]

Whilst this sounds like firewall blocking, I would have thought AIS would allow its own processes access, but perhaps not.

Does it allow avast.setup and avastSvc.exe internet access ?
- If it does delete the entry for them and do a manual update from the UI and reconnect to the internet, this should force the firewall to ask permission again.

[Lisandro]

AIS allow avast processes to connect by default.
Do you use any hosts (or, better, is your hosts file infected)?

[Pia]

The problem seemed to be related to some files of the Norton Internet Security which came with the PC I bought and did not uninstall as expected.

I could get avast free trial to work and I can connect to the internet. No more server errors.

The only problem I could not solve is that my license file is not being recognized.
AIE says I was upgraded but due dates for the software don't change. Is this okay?

Thank you for your help