The same issue is also posted in Google Chrome Help forums at Click to See this in Google Forum
See the picture for instance: (Click on picture to view it large)

Google says to go to %windir%, which simply means the windows installation folder. On my system it comes out to be C:\windows
After this it says, to launch network diagnostic\xpnetdiag.exe. Now there is no file as such at said location.
Actually there are two problems:
1) If you type what is advised by google on the Start->Run.
%windir%/network diagnostic\xpnetdiag.exe
Then there is a error saying, there is no folder c:\windows/network. Actually the path should be in double quotes. The people proficient in computer systems and troubleshooting would even know this beforehand. But I dont know why Google believes that even general people would know of this.
2) On my system, XP SP3, there was no folder named network diagnostic at all in C:\windows. So that means even if I used double quotes in the path, I got know resolution.
My personal gut feeling is that, Google sould not advise those methods which are not generic. Also, the advises should be easy to understand by the common masses. I guess, my voice being heard.