This is an email exchange I had with a roommate yesterday while I was at work.

Roommate:

What’s going on with the net at home? I have no
access.

Me:

I know for a fact that I don’t have any type of
sharing software open. So its not me.

start > run > cmd > hit ok

type ‘ping 192.168.[x].[x]‘

tell me what happens.

Roommate:

I’m not at home, but I will print this and bring it home with me.