click here and run it but before running click on 'advanced' under the windows tab on the left, and tick all apart from the last 2 (custom files and wipe free). You should also go to options-advanced and untick the first box. You should also download Malawarebytes (free version). Set it up, update it and run on deep scan (will take an hour). Delete all it finds. click here
Personally I would do a factory reinstall and the computer will run like new.