I have a relatively new Dell Inspiron that I just upgraded from Vista to Windows 7. If I put the computer to sleep, I often lose internet connectivity when I wake it up (this is the only time that this occurs). Have checked my cable modem, and connections and they are fine. Restarting doesn't work and it's a struggle to reconnect. Troubleshooter says the computer is configured correctly but I get a "can't fine DNS server" message.The processor is a an AMD Phenom 9650 Quad-Core 2.3 GHz. 64-bit system.I tried unchecking the IPv6 box to no avail. I don't know what kind of motherboard I have and don't know why that would be the problem anyway. Suggestions?