In XP you could run command prompt and type in ipconfig /flushdns then press enter.It would tell you Dns cache has been flushed if so reboot and see if it makes any difference. or maybe try Tools.Internet Options.Advanced. And press reset.That would reset I/explorer to its original state.
Try restore advanced settings.[tools.Internet Options.Advanced.] Make sure all of your add-ons are enabled. And also make sure that you have the latest Flash and Java updates.All old updates of both should be removed.
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