[Washi]

Use an Ethernet cable to plug the computer directly into the DSL modem. Run a speedtest and if you get the advertised speed then the router is the problem.

That would be the perfect test if his modem and router were two separate boxes. I'm not sure that's the case.

[raybbr]

They are two separate boxes.

I tried http://reviews.cnet.com/internet-speed-test/

Getting slow as heck readings directly through the modem.

[MtBaldy]

Well, that would be a problem then.