Cannot connect to certain websites. [closed]

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http://serverfault.com – I'm not a computer person, so please bear with me. I am using Windows Vista An hour ago I was using the computer, and my internet connection faltered. When the internet connection was restored, it would not connect me to any of the websites / serviced I had been disconnected from. Specifically, I could not connect to AIM messenger, my Ventrilo server, or AOL.com / AIM.com. This had happened once before, except with two games I had attempted playing, and MSN and MSN.com. When I did a system restore then, the problem went away, and I could connect to the websites / services / games again. (HowTos)