Safe mode.
go to start button
in search type msconfig
go to the start up area in there
unselect things that shouldn't be booting just watch out for items like your track pad, sound card etc
Download AVG and Malwarebytes or some other program. Run those in safe mode.
If that doesn't fix your issue then consider blanking everything and reformatting.
Also make sure your browser doesn't have tool bars and add ons most people have tons of those running and they are all spyware / crapware / virus laden garbage.
You can also check your program uninstall list for them.