1 Clean the computer case first. Most computers don't take the shell apart for cleaning. Actually, the dust is very thick.
2 uninstall redundant software.
3. Install 360. Inside the management software. There is a computer startup item management. Go inside. Close all non-system files, including killing software and all useless network connections.
I use bare metal. Because the computer is old. Performance of XP system and its accessories. I can only use bare metal. Only 360. Close the startup item of the killing software. If you implant a virus, open the startup item. Next time you start the machine, you will come out.
You're talking about formatting the hard disk with an optical drive. Then it's a hardware problem. It is recommended to clean it up during secondary assembly. Remember to use bare metal. There is a software configuration method above.