Two days ago we lost internet access from our home PC (desktop). I investigated and found that the computer is no longer receiving an IP address via DHCP. DHCP is running on my Cisco Linksys Wireless router. The computer is connected via a cable to the router.
My laptop was, however, still working and connected wirelessly to the same router. So I thought I'd test the wired connection with my laptop. I shutdown the radio on my laptop and pulled the ethernet cable out of the desktop computer and plugged the same cable into the laptop. I was able to renew the IP address at will, with no problems. That meant that the problem lay soley with the desktop computer.
Rather than using DCHP, I tried to give the desktop a static address. When I tried this, I was able to ping the router, but still could not connect to the internet.
Back to trying DCHP -- when I type ipconfig in the dos shell, the only two entries are:
Autoconfiguration IP Address: 169.254.31.204
Subnet Mask: 255.255.0.0
(other fields are blank)
I tried disabling the realtek hardware, and re-enabling it -- no joy.
I tried downloading and insalling the latest driver for the h/w -- also no joy.
(BTW, I tried rebooting both the router and the computer several times)
I'm about out of ideas. The only other wierd things that may be a coincidence (and I'm not sure I believe in all these things being a coincidence) is that on the same day the problem occurred, the following was also observed:
1. My AVG virus program found 21virus threats the night before, which it said it cleaned.
2. My AVG virus program is now reporting that the email scanner is not fully functional (I've never seen this message before, and I've never touched its settings).
3. Every time I reboot the computer, Windows now warns me that the firewall is turned off and prompts me to turn it back on (which I do).
So is it possible this is caused by a virus?
If so, what next? (I've run the virus checker again and found one threat each night-- mljul1.exe the first night and A0023676.dll last night)
If not, do you have any other ideas?
Thanks very much for your help!