boot into safe mode with networking, and run malware bytes. Here's a link:MalwareBytes
Once you load it, run the program, but before you scan, click the update tab and download any updates. Then scan away.
Once you find and remove any viruses, it will make u reboot. When you reboot, reboot to safe mode again, then run chkdsk, which will again for you to reboot/
Click Start, and then Run.
In Open, type cmd, and then press ENTER.
hit y to schedule the checkdisk, then reboot once it takes you back to a command prompt.