No internet access on Windows 7

No internet access on Windows 7 I have a strange problem with Windows 7. It all started couple of days ago. On my Dell XPS laptop I have two network interfaces, one LAN one WLAN. When I power up my computer I have a small yellow triangle on network icon that says no internet access for my LAN connection. I have an IP address from my DHCP. Ping does not work and tracert outputs this:
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Guest [Entry]

"Windows 7, same as Vista, supports only one internet connection, and in addition has the annoying habit of always preferring wired connections over non-wired, on the supposition that they are faster (have better metric).

See this article for a Vista solution with many screenshots :
""Windows Vista Multiple Networks: Wireless To Public WIFI and Wired To Private LAN"".

The basic solution is to use the command:

route delete 0.0.0.0 IF 11

where the IF 11 refers to Inteface List # 11 (which is displayed by route print command output, in the Interface List section). Replace this by the number in your case."