Hmmm, sounds like a Zone Alarm problem. I use it myself and it can be a little tempermental
from time to time.
Just to make sure it's not
• Open ZA and remove JO in the Program List
• In JO, set the video resolution to 640x480 and turn fullscreen to off
• When JA restarts it'll be in a window and you'll be able to see your desktop in the background
• Go to refresh the list /get new list from the internet
• Zone Alarm should give a prompt in the bottom right corner, you should be able to ALT-TAB round to it and click Allow (and 'don't ask about this again')
• If that solves the problem, you can reset your video settings
If that doesn't work, it looks like it's down to your router. Which I know nothing about, sorry.
Hope that helps,