I think I had this problem too...I think your firewall is preventing pando from accessing the internet. Even if you did allow when the pop up came up, you still might need to do it manually.
I actually added it from the pando folder under the Program Files in my C drive... its called PMB.exe
Hope I helped
NOTE: Ignore this if its confusing but in my firewall it shows that PMB.exe is allowed twice, and I'm guessing that there are 2....and furthermore Pando Media Booster is also allowed so the list on the allowances on Windows Firewall look like this:
PMB.exe
PMB.exe
PandoMediaBooster
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