"Neri" wrote in message
news:1143574371.450705.100230@z34g2000cwc.googlegr oups.com...
> Hi,
>
> I have here a Lan with 5 computers connected thru a wireless router
> DLink DI-624+, which is connected to an ADSL router DSLink 220E.
>
> I have access to 1 computer, the w.router and the adsl router. But I
> dont have access to the other computers.
>
> The problem is that one pc crashes the network when it is turned on, I
> don't know what software it's using, or if it has some kind of worm or
> virus... But when it's on, no one else can access the internet, or it's
> very very slow... I can still access the w.router web interface, but I
> can't access anymore the adsl router web interface..
>
> If I plug out this pc's cable all the network works well again...
>
> Is there anyway I can control this problematic pc, without having a
> server, and without throwing away his cable?
>
> Thanks a lot,
>
> Bruno
>
A couple of things come to mind.
First I would check the network settings of the problematic computer and see
if it set to a fixed IP address. Possibly it is using one that is already
being by another computer or even the router itself. If you are using fixed
IP values, unplug the cable to the problem computer and try to ping it's
address from another box. If anything answers then that is the problem with
a simple fix, change address values.

Try using another Ethernet cable between the problem computer and the
router. A different port on the router would also be something worth
trying. I have run into many partially defective cables or router ports
that have caused symptoms similar to yours.

Another thing to try is installing a free (for non-commercial use) copy of
Zone Alarm on the offending computer. It is able to identify programs
asking to gain access to the network. With that info you should be able to
identify and possibly kill the offending program. It's possible the program
will help you identify a previously unknown, to you, virus or Trojan horse
infection that is trying to spread.