Use Hitman pro also to get a good idea of what malware/trojans etc... is on your system, then you can search online for ways to remove it. Hitman pro is free to use for scanning, but it will not delete the problems unless you pay to activcate it.

However you may activate a free 30 day license if you cannot remove the threats with your other programs. So that's a good option if you are out of options lol. Still even without activating hitman pro, it is invaluable as it gives you an idea of what's on your system.

Also when downloading a program under 60 mb, go to virustotal and then upload the .exe file and it will scan the file using 47 anti-virus programs and tell you what problems are included with the program.

Even if there are issues with the suspicious program, if yo know you have the ant-malware programs to remove the issues ( after researching the problems online) you can still go ahead and install the program, which will usually be a free one--that's why there are malware and stuff included.

Adwcleaner rocks as well, you run it, then you restart your system, then you run it again and then uninstall it. It's a great one to use.

Malwarebytes is great also as per the previous recommendations.

And while you are at it, get ccleaner. Try this link for instructions on best practices using these programs, and links to same.

http://www.malwareremovalguides.info/pup-optional-conduit-removal-intructions/