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Looks like the UPnP options don't show in that router model with some firmware versions.
Just 2 threads I found, you can Google for more info:
https://forums.qwest.com/qwbb/board/...&thread.id=983
Re: Trying to enable UPnP on an Actiontec GT701-WG Router - PlayStation®3 Media - PlayStation.com Forums

So assume that UPnP is already enabled in your router... did you change LW's listening port? Change listening port > click ok. Restart LW.

Before you set up port forwarding, you'll first need to set up a static IP address. Check this link for your info: PortForward.com - Free Help Setting up Your Router or Firewall

Then the port forwarding instructions for your router are here: Port Forwarding Limewire on the Actiontec GT701-WG
LW's listening port, port in the 'manual port forward' box & port forwarded within router configuration must all be the same number.

If you're still stuck after port forwarding, try one of those other apps & see whether you can connect.

It's always best to try the free version of a program before paying for it

D-Link router does have UPnP in the later models. My model didn't & I definitely needed to port forward it.

Both computers will need to have LW set to run on different ports to each other. A router will reserve one port per computer & application.

Also, try copying your Gnutella.net file from your XP computer across to Vista .. whilst LW is closed of course.

No worries. Some words you used triggered the antispamming mechanism and made it temporarily invisible.

Try installing this older version of LW... see whether that works. Sometimes people have trouble with a particular version for unknown reasons. You'll find a link to download 5.3.6 here: Old Version of Limewire 5.3.6 Download - OldApps.com

Nope, i still cant... I tried to login to my router today and the page dosn't even pop up anymore. either. i am really started to hate it. i also read some reviews on it and they said it is Junk.