was it able to connect after booting into safe-mode?
if telnet is able to connect then that means the TCP protocol is getting thru.
try this option:
netsh winsock reset all
Open an elevated command prompt.
Windows 7 - click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as Administrator. If you are prompted for an administrator password or for a
confirmation, type the password, or click Allow/Continue.
Windows 8 - right-click Start icon, select 'Command Prompt (Admin)
Type in the following command:
netsh winsock reset all
(Info: Most of the Internet connectivity problems arise out of corrupt Winsock settings. Windows sockets settings may get corrupted due to the installation of networking software, or perhaps due to a malware infestation. You will be able connect to the Internet, but the packets won't transfer back and forth. And errors such as "Page Cannot Be Displayed" may occur when using a browser.)
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