Keep this up your sleeve.
I came across computers with its camera light on right at boot. Some that after a while blinked command prompts that disappear and then the internet bandwidth started going low. Some with messages all over the screen right after boot. I resolved the errors in all of them with the Selective startup method.
Windows + R and type msconfig, press enter. Now change Startup Selection from “Normal” to “Selective startup”, and un-check the second option: Load startup items. Click OK to accept your changes. Then reboot.
No matter how savvy you are with computers, keep this handy. If you don’t know what you are doing, you just changed a very important rule in your operating system. And from now on, after reboot, no other software but system services will load at start up, just the essentials for Windows to operate perfect. This means that you prefer to choose what to start instead of allowing the software developers, from diverse companies, with diverse criteria, do so for you. You may notice that after reboot, some icons next to the time are missing. Those were a visual representation of Apps your system was running in the background, and now it is not anymore. Notice that not every background app will have a visual representation, and that many more you couldn’t see didn’t start, and this is the key of this. Malicious software usually runs in the back without telling you what they are doing.
Now, about the root of the problem, probably is a good idea to dig why the system startup was bad in its normal setting. The software causing the issue in the computer remains installed in the system, but it is not running, and that is a huge difference. Time to hunt and uninstall.
Understanding how the startup of a system works, is key to know how computers work. Procedures like this help with that. Did you know it?