Fa rmore details needed to try forming an assessment.
In case you got hit by malware: you do not want to hear this, like nobody wanted to hear this in past years whom i told it: a once corrupted system remains to be corrupted, no matter how good and trustworthy any repair or cleaning went in your hoping. Because you can never be certain you got them bad guys all.
I came to the conclusion already years ago that it is not worth it to repair, hope and pray. If there is malware installed, then nuke the system, and either install fresh manually, or from a clean system image on separate HD. Do not copy back saved data, saved games, pics, files, that stem from the infested system while it already was infested.
A "cleaned" system needs to be seen as corrupted nevertheless.
Once corrupted, always corrupted.
Before pressing the red button, make sure you are certain you got hit by actual malware of any sort.