Download and install MalwareBytes Free
and update it, then reboot into safemode and run a full scan, then check the log for any infections, then select them all if any and delete them, then reboot into normal mode and then run another full scan.
Also download Ccleaner
and clean up your computers windows temp files/internet cache etc....
then report back with an update and if need be we can take a deeper look into the issue here.
Also if you have programs installed that you dont use, what we call "bloatware" then choose to uninstall them.