I used to have the same problem until my Windows XP shut down (-the warning on a blue page-) practically everyday. I decided to restore things as when I bought my computer. It was bought with Norton antivirus pre-installed in it. Because I don't use Norton I got rid of it completely and installed another antivirus software. I disabled Windows firewall and use my antivirus firewall. LW is among the programs my antivirus allows and everything is working fine. So make sure there's no antivirus software that had been running in your computer, that you thought you got rid of completely but which is still running in the background. Also if you use a router make sure that it's not blocking LW.