check the windows event manager for errors
check your autostart/run for unnecessary apps
uninstall unnecessary apps
to have a look what the problem could be:
run userbenchmark.com and post the http link of your result, e.g.
https://www.userbenchmark.com/UserRun/28977730
check windows integrity
open the command prompt as administrator and type DISM /Online /Cleanup-Image /RestoreHealth
https://www.lifewire.com/how-to-open-an-elevated-command-prompt-2618088
https://answers.microsoft.com/en-us/windows/forum/windows_10-update/system-file-check-sfc-scan-and-repair-system-files/bc609315-da1f-4775-812c-695b60477a93
clean boot
https://support.microsoft.com/en-us/help/929135/how-to-perform-a-clean-boot-in-windows
check the memory by running memtest.org usb autoinstaller (bootable USB flash drive)
check the hard drive for errors with its manufacturer´s tool and eventually update its firmware if available