Cannot access Internet in a LAN, while others can

When I set up computers for my house mate today, a very strange problem occurred. Three computers were connected to a local network, all can open the modem admin page. However, only two of them can access the Internet, the third one cannot. Also the third one cannot join Windows 7 HomeGroup. It will tell you the password is incorrect, but you are 10000% sure you typed in the correct password. Furthermore, there is a second network named "Unidentified Network" showed up besides the original one, though you only have one adapter.

Probably 99 in 100 people will blame Microsoft, and claim HomeGroup is buggy, don't use it. The problem is that, we need to 'thank to' Apple on this issue. Surprising, isn't it? This issue is caused by Bonjour, an apple from Apple. Follow the post at http://nw360.blogspot.com.au/search/label/bonjour to remove the unwelcome software.

Remove Bonjour completely

I know you may be an Apple fan and not be interested in removing the by-product of Apple software. But sorry, I am not. I am strongly against the software which have malware behaviour. After uninstalling iTunes and Bonjour, Bonjour, installed by iTunes, like a ghost, still remains in my computer at C:\Program Files\Bonjour, and I cannot simply delete it. It behaves like a malware.

Wikipedia (http://en.wikipedia.org/wiki/Bonjour_%28software%29) gives me a solution which is provided by Adobe:

• Open a Windows command prompt and type the following command: "C:\Program Files\Bonjour\mDNSResponder.exe" -remove
• Navigate to the following folder in Windows Explorer: C:\Program Files\Bonjour
• Rename the mdnsNSP.dll file in that folder to mdnsNSP.old
• Restart your computer
• Delete the Program Files\Bonjour folder

The reason why I installed ITunes is that my sister gave me a iPod. If I am going to buy a new MP3 player, sorry, no iPod anymore.

By the way, why does Adobe provide the way to remove Bonjour? The answer is installing Adobe products introduces Bonjour.