If I may address some of the assumptions that may be in your replies.
The printer itself is at the "inexpensive" end of the range. It has no control panel except for a button that has "WiFi" written on it and a flashing red/green light with WiFi written underneath it.
When the Wifi button is...
Hi
Want to get my Epson XP-200 Wifi connected to Windows 7. Particularly frustrating
Using the install CD that comes with product eventually ends up with the Green-Red Wifi light blinking back and forth for a while and then just blinking red (failure).
Googled a bit and found a suggestion to...