also consider the fact that mybe malware might be playing a role in this! if you dont have an antivirus id suggest you download a few programs.
free av is better than most subscription antiviruses, its really good if you have nothing else!
those two links are antispyware and antivirus respectively.
run them both in safe mode to unroot lots of viruses! if you have them. the easiest way to access safe mode is to turn off your computer while its on with the power switch, make sure your not doing anything important. the next time you start up you should come to a screen that states that windows never got shut down properly and it asked you if you want to start it up normally, the best last setting that worked, safe mode and safe mode with networking. you wanna scroll over to the regular safe mode option and press enter. when it starts up you can simply navigate to your antivirus and antispyware and do a deep scan.