If this is an Acer, it most likely has a recovery partition on the hard drive that can be used to restore to "factory" condition.
Consult your manual. You'd use a program and series of menus provided by Acer. Should be in your list of programs or possibly in your control panel.
If you do this, it will WIPE OUT anything added to the PC since you bought it--your personal files, pictures, videos, mp3s, etc. And any new programs you have added since the purchase. You would have to back up all of that stuff or lose it forever.
Or---you could do a clean install, which you may prefer anyway. That would give you an ordinary Windows installation, not the installation that Acer put on the machine. To do this, you'd have to have the 25 character "Product Key" that should be found somewhere on the machine on a Certificate Of Authenticity sticker.
It's possible you have defective hardware, such as a failing hard drive. I'd probably check that out first. I'd download the drive manufacturer's diagnostic tool and run it. Get it from the manufacturer's web site.
