wildbill7145;387424 wroteComp's bang on here. Keep this updated, run it weekly. At least.
Two others I can suggest, good old Super Anti-Spyware,
SUPERAntiSpyware - Downloads
as well as this Adware removal tool to cleanup browser malware.
Adware Removal Tool Download - Tech Support AllTech Support All
I hadn't really used SuperAnti-Spyware for a few years but it's later versions seem much better than a couple of years ago.
Once you have removed all the malware with these tools, suggest you run ccleaner registry cleanup to delete all the dead links in the system registry.
Can make quite a significant difference in performance.
https://www.piriform.com/ccleaner
Make sure you stick with the free versions and resist the tricks to install the "trial" versions as you will be bugged afterwards to pay.