I have a laptop running Windows Vista Home Premium, and I have a strange issue with Internet access. I have DSL from a wireless router. Whenever I start the computer, there is no issue with Internet access - all applications are able to go online without a problem. However, after a while - anywhere between 30 minutes and three hours - browsers are unable to access the Internet. All other apps are able to connect - FileZilla, Windows Media Player, Windows Update - and I am able to ping all websites. However, no browser is able to connect - I've tried IE, Firefox, Chrome, Safari and Opera. I have ZoneAlarm Pro, and have not been able to figure out anything with its settings. The situation persists even after I shut down ZoneAlarm Pro. A restart resolves all of this, and I am able to browse - till the next time it goes 'offline'. Anyone faced this issue before? Any ideas on what I'm doing wrong?