|1) Go to safe mode and try web browsing from there. If you can, it's a good indication you have either problems with Windows or a virus/spyware. |
2) Download and update but don't run the scans for MalwareBytes, SuperAntiSypware, and CCleaner. These are all utilities that will help you clean up your system.
3) If that doesn't work, turn off Internet Explorer in the Turn off Windows Features menu, then reboot, then re-enable it and reboot again.
4) Try downloading a different browser from safe mode if you can and re-download IE.
5) When all else fails, backup your stuff and reinstall Windows. If that fails to solve the problem, get a new hard drive for the system and install Windows on it. It's highly unlikely the issue will proceed past this stage.