The help desk and knowledgebase offered by Malwarebytes is top notch. Install is fast, it auto updates and removes items lightning fast. It will remove all the malware that is on your PC. My first step as yours should be, when trying to fix a slow pc, should be this software.
As a Tech Professional for 20 plus years, Malwarebytes has always been my go to software for PCs that are slow or that have possible Trojans or malware installed.