PareM,
I see you have a valid ip address.
Did you activate McAfee or is this the trial version? If activated, get your information and I would first try removing McAfee using the McAfee Removal Tool to see if you can connect. If you connect, then restart the computer and reinstall McAfee.
Go to Drivers & Downloads enter your service tag number, then select your operating system. Under Network, download and install the latest drivers.
Try these tweaks....
Start, control panel, device manager. Click on Network and then right click on your wireless adapter, left click properties, power management. Uncheck the box, allow computer to turn off this device to save power.
Click on Advanced and look for antenna diversity. If your system has antenna diversity(not sure about this adapter) change the Antenna Diversity from Auto to Aux.
Go to the power options, and changed the Wireless Adapter Setting, from Maximum Power Setting to Maximum Performance.
Rick