High CPU usage and adapter issues

Hi all recently chaslang from this site helped me to get rid of some viruses that were infecting my system and they aren't there anymore. However, its been about a 4 days since its been rid of the viruses and now I hear my computer running loudly and the CPU randomly jumps up to 50-100% while the computer is idle. Also, whenever I turn my computer on it beeps and says that the adapter is not recognizable (I assume it means the battery but its the one it came with and had no problems before). I don't know if there is still a virus still in there or if in the process some things got damaged but I would like to know if anyone has a solution to this problem. Thanks.

 

Are you able to go to Processes and tell if there is a process that should't be there????

 

Now since I rebooted my computer it doesn't seem like its doing it as much. But when it was acting up I did not see any process that was taking a large amount of CPU. I did run a malwarebytes scan and after that it started to run like there were multiple processes. However, I still get the AC adapter message when I boot up my computer not recognizing it. I know this is not much to go by but if there is anything else I should check I'll post it. Thanks.