Most probably, your TCP/IP stack is corrupted by a badly installed "plugin".

You may try uninstalling TCP/IP in your network configuration panel, reboot as required, reinstall TCP/IP from your Windows CDROM, and reboot as required. This should restore a working TCP/IP stack without this incorrectly installed "plugin".

(This may be an old "download accelerator" or a third-party supplementary toolbar for Internet Explorer, that you have deleted without uninstalling it properly, and that does not support TCP/IP traffic on Internet which is not some known protocols such as HTTP for web navigation, FTP for downloads, SMTP and NNTP for mails...)

If this does not work, you should retry by unistalling your Remote Access Card in the network control panel, and reboot. Then reinstall the Remote access network components, including TCP/IP (or use the install CDROM given by your ISP to restore the network components).