I will combne my answer here with the other thread that you opened in which you logon does not work.
What you have is a virus, or malware. If your computer iwll allow you to, download malwarebytes, a free program, at http://fileforum.betanews.com/detail/Malwarebytes-AntiM...
install, run, update, scan.
If you have the nasty virus I suspect you do, the virus will not let you run the progarm. You will then have 2 chioices; either take the computer to a shope for an expensive cleaning, or, remove the hard drive from your computer and take it to a friend who knows computers and have him plug it into his system as a secondary drive and have him scan it with malwarebytes to clean it. You can then reinstall it in your system safely.
If the virus has damaged the operating system, then you will have no choice but to reinstall it.
Start PC with Safe Mode with Networking. Download and install Malwarebytes as above. Run the updates to it and run the Full scan on the system. Also get the Avria Antivir rescue system .iso file http://www.avira.com/en/support-download-avira-antivir-..., make the disk from it, and run that scan on your computer.