Well actually you cant. The software is locked in an N-Series phone. You will have to take it to a mobile shop and ask them to replace your OS. They will do it for you (At some cost of course). That will surely fix your problem.
Well 4 port routers are expensive. I think the one im using is pretty good and works absolutely fine in Vista and even with the Linux platform. So far gave no problems with any Vista update.
Gayan is also using the same router. Will cost about Rs.4000 now.