Yub100,
WPA-PSK(TKIP) Security(Personal)? Channel 11 is great.
When you installed the operating system, did you install the drivers in the correct order? Chipset drivers first or the rest of the drivers will fail to install. How to Download and Install Drivers in the Correct Order You can start with the chipset drivers and follow the list if you installed them in the incorrect order.
McAfee was not installed on the computer? If it was, try running the McAfee Removal Tool
Try looking at the Norton Firewall settings. This is for printers but should get you in the area toi check the firewall settings. CLICK HERE
Rick