Can not disable wireless network

Ramdomly my wireless connection is now malfunctioning. I have an inspiron 600m. When i open my internet browser, I get the error message saying check your internet connection, the standard white page when you are not connected to internet service. However, the icon on the bottom right says i have as signal strength "very good." So i go to repair my connection and this message appears...following error "windows could not finish repairing the problem because the following action cannot be completed: disabling the wireless network adapter" then "make sure your network adapter is properly installed."

 

so then i go to my start menu, my network places, view network connections and attempt to disable my wireless connection...the following error appears..."it is not possible to disable the connection at this time. this connection may be using one or more protocols that do not support plug-and-play, or it may have been initiated by another user or the system account"

 

for weeks my connection has been fine. what is wrong with my internet connection. i have already run a virus scan, spysweeper scan, disk cleanup, and went to the dell site and ran a dell checkup scan on my computer, no errors have appeared. my computer is also not running slow.

 

can anyone help me please

 

much appreciated