Absolutely could be malware if you something was loaded from a not trusted source. The truth is that so much of the malware out there today goes completely undetected. The only way you ever know you have it is when a system starts behaving strangely. You can run a malware scanner like malware bytes. I suggest running r-kill then rouge killer then malware bytes. Run them from safe mode. You can pick them all up at bleepingcomputer_com or majorgeeks_com. Both trusted sites IMHO.
fair point. I believe you are right, I don't think I ever saw anyone below an RX complaining about the GPU usage issue either.
You didn't mention your little brother's age, But you should advice him it is a No No to turn off an Antivirus protection to install a program. If the Antivirus program was preventing him from installing the 3rd party software it probably believes it is infected or dangerous to install. If you are dead certain, as pokester mentioned, that you know the 3rd party software creator is valid and has a good reputation than you can disable the Antivirus temporarily to install it. Sometimes Antivirus programs has a False Positive concerning 3rd party software and tags them as dangerous or virus infected.
Another weird thing, when I'm install the Spy hunter into my PC it got instant blue screen. And my CPU and GPU are 100% usage.
What was the BSOD Error that it mentioned? Also was the BSOD while INSTALLING the software or after you installed it and starting to run it.
Uninstall Spy Hunter and install Malwarebytes which is similar and more compatible with Windows 10. When I went to Spy Hunter's website, Mcafee was telling me it is a dangerous website to go. To go at my own risk which I found unusual.