I remember in the olden days, those problems could often be solved by ad cleaner software from the web.
It has been quite some time since I had such problems myself actually. I'd probably just reinstall Win. Just to be sure.
"Enlightenment is man's emergence from his self-imposed nonage. Nonage is the inability to use one's own understanding without another's guidance. This nonage is self-imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use one's own mind without another's guidance. Dare to know! (Sapere aude.) "Have the courage to use your own understanding," is therefore the motto of the enlightenment."