I most sincerely hope you have backed up your important files. In order to try to determine if this is a hardware or a software problem you can try a bootable CD, a good example of which is Ubuntu. If you cannot boot to the desktop in Ubuntu then you have a serious hardware issue. If you can...
If the link does not work fine, but in FF in IE, which is indicative of or a new installation of malicious software, they click the IE browser for the proxy server settings such redirected elsewhere. If you have attached IE8 plugin, you should be banned because they are lost or wrongly. You...