Hello, I’m Virginia, I have 20 years of expertise in fixing my own & friends’ PC problems.
Sorry to hear you’re experiencing problems.
Visit the PC’s manufacturer’s website for any BIOS updates &/or any driver updates.
Check Windows update for any updates.
Right click on start & choose powershell with admin & enter:
SFC /SCANNOW
DISM /Online /Cleanup-Image /StartComponentCleanup
DISM /Online /Cleanup-Image /RestoreHealth
Check for any malware infection:
MBAM free: https://www.malwarebytes.com/mwb-download/ ensure scan for rootkits is enabled.
Eset online scanner: http://www.eset.com/us/online-scanner/
Adwcleaner: https://www.malwarebytes.com/adwcleaner/
If these find one or more infections but do not fully remove them it will be wise to register with a malware removal site to receive dedicated malware removal instructions, an expert will remain with you throughout the process until confirmation that your PC is 100% clean.
Malwarebytes virus/malware removal forum:
https://forums.malwarebytes.com/forum/7-windows...
Bleeping computer malware/virus removal forum:
https://www.bleepingcomputer.com/forums/forum22...
Disclaimer - This post contains reference to non-Microsoft websites and there may be ads on the page for products & services including products frequently classified as a PUP (Potentially Unwanted Product). Please thoroughly research any product / service advertised on the page before you decide to use them. Your discretion is very much advised.