have you tired running /sfc scannow? (command prompt)
reinstalling tcp/ip/
http://support.microsoft.com/kb/299357/en-us
CHKDSK /F (command prompt)
try abit of computer maintenace, believe it or not i once had an intermittent error and disk defrag once fixed it... lol!!
also this might be the 1st thing to try, go to your lan connection and right click properties, disable "show on desktop" ok and then "show on desktop" see if that helps
keep us posted.