To answer your question about other routers. Yes it's very likely, but there is a workaround. I'm guessing that you use wireless to connect to all routers/modems.

You will need to set up your Networkcard twice and have both disabled at startup. Meaning you set up a new connection with a static IP that your Belkin router will accept.

To find these numbers. Connect like you do normally and then go to Start>Run then type cmd in the box and press enter. Now type ipconfig /all and press enter.

A list will show up after doing this. If you have more than one networkconnection then one will show for each.

Write down the following

IP address
Subnet Mask
Default Gateway
DNS servers

then type exit and press enter

And now I'm stuck because I don't have a computer with Danish Windows + I never tried it myself. This is the best way though. Alternatively you could change these between automatic and adding these things everytime you use Limewire.

You could try that to see if it works, and if it does then figure out how to setup the new networkcard like I tried to explain before