Hi, you do have a virus and or trojan.
Please download Malwarebytes anti-malware from http://www.malwarebytes.org
When you download choose save to disk and rename the file to anything you like, The reason for the rename is many newer trojans can identify malware removal tools and prevent them from working as well as disabling you regedit and task manager.
Let anti-malware install and update and perform a quick scan.
When its finished have it remove what it can. If it asks to reboot do so.
When you have restarted your computer download Avast anti-virus
from avast.com again renaming the exe when saving to disk.
After install it will ask if you wish to schedule a boot time scan select yes. Then it will tell you to restart your system, choose restart later. Open avast from the start menu and select settings. Go to updating and update the virus signatures. Restart your computer when the update is complete.
You have to watch the screen as avast will alert you and ask for your preferred action on what it finds.
When completed your computer will boot normally into Windows run both scanners again in the same order.