There are ways of using the one router from different rooms in the house without needing to move the router itself. In fact, they are designed to be left to sit in just one place. On top of that you can't connect two routers to the same broadband connection at the same time, it just won't work.
Your options are:-
1) Run an ethernet cable from the router to each room you want to access it from;
2) Set up wi-fi access on the router and on the computer and / or on the PVR if it supports wi-fi;
3) Use home-plugs which allow you to connect using your mains ring.
Or a combination of all three. If you mainly use your computer just for email, web browsing etc then wi-fi is more than sufficient to handle that. Only if you are forever moving big (and I mean really big) files around from one computer to another would an ethernet wired solution be better.
In your position, I would leave the router near the PVR connected by ethernet cable which provides a stable fast connection from streaming from iPlayer etc. And use wi-fi for your computer which will work from anywhere in the house (unless you have an unusually large house or one of unusual layout or construction).
Edit: Damn! Beaten to it.