Follow Yessir's instructions, and look through your installed software by going to control panel and selecting uninstall a program. Optimizer Pro is a despicable type of 'leechware', it's as close to malware as you can get without being malware. When you install software you want, the installer gives you the option to 'install using recommended settings' and discourages other options. Accepting will install a bunch of crapware like optimizer pro, and declining will lead to numerous Accept buttons themed to look like the software you want but being more useless deals.
This is the adblock he was talking about.
https://chrome.google.com/webstore/detail/adblock/gighmmpiobklfepjocnamgkkbiglidom?utm_source=chrome-ntp-icon
Sort the installed programs by date and uninstall ANY software you don't recognize if it was installed after your PC was initialized (don't uninstall any drivers). Here is a list of software that might cause ads.
MyPC Backup
Search Protect (AKA Conduit Search)
Desktop Weather Alerts
Anything claiming to convert (Except VLC, and only if VLC was installed correctly).
Anything claiming to play video files (Once again, VLC and any other software YOU installed)
Anything claiming to download. Period.
Good luck removing your junk!