Internet connection for Xpcman

One of my computers is having trouble accessing any web pages, even though I am connected to the internet by wifi and I found an answer from "xpcman" in which I would have to go into the registry.

I followed the instructions and everything was ok until I got to the part where I have to edit the {GUID} DWORD value. The instructions said to add another value but it would only let me type two letters so I could not go any further. I closed the registry and turned off the computer.

After that, it would not start and after several attempts, the software said it was attempting a auto- repair and would take an hour. When it finished the computer started but, of course my wifi would not work because I had altered it. That was yesterday and I have not checked it since.

I would like xpcman to get in touch with me if possible to explain more of the registry because when I "HKEY local maching system there were five entries in the GUID and I picked the one that had the numbers of my wifi so I think I picked the right one. I have a backup of the registry but if I put that back in, it will not fix the problem. I have had this problem at other times on different machines and is seems to be a common problem but I would like to fix it once and for all and spcman seems to have it sorted but has to be more specific.
Sorry for the long spiel but I hope he will get in touch.----Allan