My antivirus does not work after uninstalling windows 10 and return to windows 7

I have upgraded to windows 10, but has had a few problems in general, especially with my keyboard, the printer, chromium and the office so I decided to go back to windows 7, but since kapersky does not work on my computer. I have full protection, but it will not work. I tried to restore my computer, but there is nothing before the upgrade to windows 10. I tried to restore to a previous version kapersky, but there aren't any. I can't uninstall it because it says it has been removed, even if it is still in the same place, I can't go back because he said that I have already. I tried running as administrator and in compatibility mode, but still does not work. When I try to run as administrator it says I don't have permission to access the item, but he isn't blocked or something. I don't know what else to do. Any ideas?

You will probably never get Windows 7 running again, until you perform a new installation of Windows 7.

I recommend a factory restore.  There is a hidden on your hard drive partition (assuming you have the original OEM hard drive) that has a copy exactly what was on your computer when you first started it.

Tell us the brand and model and we will send you instructions on how to perform this.

First of ALL, download your saved data.  Factory restore erases everything.

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