High CPU usage is not in itself necessarily an issue, and will often be normal with assorted 4 and 6 core processors in many games at 1080P, for example, and, are a fact of life for 4 c/4t systems.
Even a good running system will have 60-70 Service host tasks listed in Process Explorer, so a high number is not 'bad'. (Not sure how busy one or more of these would be during a game, however)
Check and see what your CPU usage is just sitting at the desktop with no browser open, no apps running; as many forms of malware will hide/suspend themselves from task manager, best to open process explorer, sort of a 'task manager on steroids'...
https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
As always, it never hurts to run Malwarebytes Antimalware scan, Kaspersky's TDSS AntiRootkit, and Hitman Pro64, all free...