Partial disconnecting?

Hey guys, I've been getting disconnected from a lot of websites for the last few days now and I'm getting sort of frustrated. I'm on facebook, looking around and then I decide to go on google for something and then it tells me i'm disconnected.. It's not really disconnecting but It shows me that the site can't be connected. Even if it says that, I can still go on facebook. Facebook doesn't seem to have any problems but all the other sites I try to get onto are unable to be connected. I'm calling this partial disconnection for now, but can anyone help me on this?

I'm using Windows XP btw
 
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