|I'm at work so unfortunately I don't have access to specifics at the moment. I'll try to answer as best I can.|
> Can you connect ok to internet etc. when using cat-5/ethernet?
I haven't tried this yet, my PC is upstairs and my router is downstairs. I'll try it tonight, my assumption is that this will work fine but I'll have to confirm.
> Have you actually configured your "new" router properly for wifi; which is done via a cat-5 connection to the router (and the router's web page/ management (wireless).
Yes, the router is working fine. I have a Bluray and Xbox360 directly connected to it, and a separate laptop and smartphones are able to wirelessly connect fine.
> What make/model is the wifi adapter in your computer?
The cheap one I tried first is the Edup AP Mini 300 - http://www.newegg.com/Product/Produ...
The one I picked up yesterday had Linksys on the box but had Cisco stamped on it. Looks like this one: http://www.amazon.com/Linksys-AE120... I can confirm the model # tonight.
> Have you checked to see if the wifi adapter (in your computer) is ok; any error/exclamation marks against it the system\device manager info?
Yeah, both receivers show up correctly in Device Manager without any issues.
> Have you considered updating drivers for adapter?
Both receivers came with installation disks with the drivers. I guess I could look online for newer ones and transfer them onto my PC, but this seems unlikely to fix it.
>If your computer is a laptop, does it connect ok tonother wifi access points e.g freebie points, internet cafes etc.?
Not a laptop unfortunately. There's an unsecured network near our house and I tried connecting to that - same problem. Able to connect to no access to pages.