Hi,
After having erroneously upgraded avast from the free version to the trial version, the PC (Windows 7 x64) lost it's internet connectivity, it didn't receive it's ip from the DHCP server anymore.
The following was tried:
1 Restore PC at an earlier date (failed to restore)
2 Uninstall Avast.
3 Install the older avast version.
4 Connect using a wired connection instead of a wireless one.
5 Scanned for virus with a bootable USB key, the system is clean.
6 Uninstalled every software with services/drivers.
7 Checked manually for unwanted software with sysinternals autoruns the system is clean, no non microsoft code outside of Hardware drivers!.
8 Reset the TCP/IP stack form an elevated command prompt (netsh int ip reset c:\resetlog.txt, netsh winsock reset all)
9 Reset the windows firewall to its default state
10 Disabled the windows firewall (no other firewall is active, see step 7)
11 Forced a manual IP (and checked the ROUTE PRINT)
12 Uninstalled and reinstalled Network Hardware
13 Tried safe mode with Networking
Still nothing restored the connectivity symptoms are:
The network card fail to get an IP (it is autoconfigured in the 169.x.)
ping ::1 and ping 127.0.01 both reply with general failure.
arp -a do list the router mac address, indicating good driver, cables etc.
The network connectivity is also good when, running from diagnostics disks confirming the absence of hardware problems.
Clearly those are the symptoms of a firewall action. However, none are present.
So I'm stumped and envisaging a system reinstall.
Does anyone have any more idea before that?
