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I've run into computers that can't display Web pages in Internet Explorer even though they can connect to their ISP account. This sometimes occurs after adware gets into the system. Removing adware helps the problem sometimes (in general, you probably want to remove adware anyway.) However, it's also possible that the reason Web pages can't display in Internet Explorer is because the TCP/IP is corrupt.
To reset TCP/IP, go to the Start menu, select Run, type CMD and then hit enter. Once at the command prompt, type: netsh int ip reset iplog.txt.
The last part of the command: "iplog.txt," is the filename of the logged results of the command if you want to view it. The name can be altered as you wish.
This will reset some registry settings for TCP/IP and hopefully get your Internet Explorer functional again.