sorry for the late reply, your message was in my spam folder. The last suggestion was a good one and now everything works fine. Thank you very much. tom
I have a Latitude E6510, Windows 7, 64 bit. Wifi connection was fine yesterday, now can't connect. Router ok, other computers on it do fine. System restore no help. Switch is on. I uninstalled and reinstalled driver software, disabled and enabled network adapter.  Device manager says everything enabled and working fine. Diagnostic tool: hardware test failed "driver version does not support Intel PROset/ wireless."  No virus or malware detected. What can it be?
Latitude E6510 cant connect to internet