I just get rid of malware and it seems that was not causing the network problem.
I have a Compaq pc, Fujitsu-siemens pc and a Medion Notebook on a wired adsl router SMC 7404BRA with modem.
Fuji and Medion do have internet together, but once Compaq turns on and get on the network, it blocks all internet access. I tried pinging google and it works on all computers but none get on the website itself.
I gave all a static IP, because previciously I had an IP conflict.
All computers are running on XP home edition. Fuji is the one which was infected with the malware and Compaq has just been formated and is actually an empty pc. Because it couldn't connect to the internet it even didn't had an update yet.
All computers have access to the router, so the wires are ok.
Medion and Fuji have internet access separately, Compaq can't even connect alone.
I'm just lost here... Can anyone help me??