I'm running Windows 10 here. Over the last month my computer has been acting a little strange, with extremely slow boot up times (10+ minutes) and/or desktop initialization after logging into my account (sole user) that often led to total hang ups or frozen screens . Also occasionally noticed the command prompt opening on its own for a brief moment on my first login attempt after a hard reboot. I attempted to fix the issues with cable-provided McAfee scans and a few additional programs (CCleaner, Spybot, and maybe one other, can't recall) and didn't really see any improvements. After this I got sufficiently paranoid and decided to restore my computer to factory default.
After my computer was reset (~2 weeks ago) and set up with my programs I stopped noticing the issues so I started to feel cautiously optimistic. The command prompt on log in occurred one more seemingly random time but I didn't notice any of the other sluggishness or freezing/hang ups so I remained on watch and ran my anti-virus scan but nothing else.
However, today I received a very strange and unsolicited phone call from a person claiming to be with "HP support" claiming that my computer was sending "malicious reports" to their inbox. There were very few coherent details but he seemed to know my first name, my phone number, and that I owned an "HP computer." It was a strange conversation, especially since I have not been in contact with HP support, and never regarding this current computer. Anyway, this raises all my red flags but I also feel like the situation is beyond my beginner-moderate ability to troubleshoot. Advice, please?