I have been turning my computer off for years and have never had a problem with it. In fact turning the PC off will reset some problems you might have.
At the time I was able to find parts at an electronic store, (first in Dallas), an installed switches as required, memory upgrades and gulp a floppy drive!
My computer is on all the time and whenever an update arrives it will restart. Make sure your PC has a condom, (Norton) and surge protector. They do work despite what OBummer says!