Boring topic I know, but after 10 days trying to fix this...
I have 3 pcs. The 2 laptops connect fine. Suddenly the desktop, which was wired to the router/modem stopped connecting to the net. I thought it was the integrated adapter (HP Pavillion). I bought a wireless adapter, but same problem. I tested the adapter on another pc and it works fine.
I have done netsh winsock reset dozens of times. Have reset router dozens of times. IPCONFIG/ALL shows the wireless router, but with a 169.x.x.x IP. I manually went into the ipv4 properties and told it to use 192.168.1.100. I've turned off every firewall type program I can find, although my kids do use some peer 2 peer but I think they are all off.
Can anyone please suggest anything else? I know its not the router or the adapter. ARGGGHHHHHH!!
Frustrated in Boston
Yep....I suspect something they've downloaded from the peer to peer has messed you up.
Download Spyware Doctor from one of your other computers, stick it on a thumb drive and install it on the problem PC and run a full scan.
Since you've manually assigned the IP and still got nowhere, even with an alternate NIC, we can pretty much rule out hardware.
I would also disconnect the machine from the network until you scan and clean the system.