Router password

[#1]

I'm a new member and have tried to change the router password I was issued with. Somehow I've got into the situation where the router address will neither accept my new password or the old one. Does anyone know what to do next, please?

[#2]

Reset the router to default.
Welcome to the forum BTW.
Which router is it?

[#3]

Thanks for responding so quickly.
The router is a Thomson 585v7 Plusnet Version.

[#4]

look here:
http://www.plus.net/support/broadband/hardware/t585v7new.shtml
search down to find
What are the router username & password?
also read;
Resetting your router

[#5]

All sorted. Thanks for the help.