Hi Jamie,
1. Did you try updating the network adaptor?
2. Are you using wired/wireless network connection?
Update router and adapter firmware
Your router or network adapter might need a firmware upgrade, especially if you're only able to connect using WEP security or no security. Firmware is the software that is embedded in a hardware device and controls how the device interacts with the operating system.
Download a firmware upgrade from the router or adapter manufacturer’s website and apply it, following the directions on the website or with the downloaded file.
Hope it helps.