i do think that the problem is coming from the router. have you tried using another one and see what happens?
another thing is that have you tried to ping a network address?
if the pinging is successful then it must be working fine. to try to ping a network address just open the command prompt and type in in the command :
say : ping en.kioskea.net
if it gives you successful result then you must have an IT technician have a look at your pc.
hope it helps you helen