- How exactly did you set up the wifi? The usual Windows XP screens for that aren't asking about gateway and DNS, as far as I remember, only SSID and encryption data.
- Are you using your own private router, or are you trying to connect to a public hotspot?
- That error 0x80072f78, does that occur when you try to use that non-working wireless connection or when using a wired connection?
- How do you manage to connect the forum if nothing works?
- What browser is "it"? Internet Explorer, Firefox, Opera?
- How does your original post over wrong applications fit into the picture that you sketch now?
It's all very unclear. Try to write ONE post and CLEARLY define and describe all your problems.