Can't connect to Westell Router

[Guest KDEJ]

I recently got a new desktop PC with Vista Home Premium. Until two days ago

it was connecting to my wireless router and the internet just fine. Now it

will not connect to my wireless network at all. Sometimes it shows up in the

available network list and sometimes it doesn't. Every now and then it

appears to be connected but then when I go to access the internet it fails.

I've spoken with Verizon Internet support and HP support at length with no

resolution. My HP has a USB wireless 802.11 b/g adaptor. My two older

laptops (both HP) have windows XP and are connecting to my Westell router

with no problem. I assume the problem is with the new computer running Vista

and not the router.

 

Please, can anyone help me?