This ^ will not re-install Windows, it's only for troubleshooting issues.
You need to contact Acer and get recovery disks sent to you unless you have a restore partition built-in on the laptops. Most new PCs come with a recovery partition you can access during boot up, and a utility you can make your own restore DVDs with. But most people never read the manual or ignore the recommendation to create a restore disk set until it's too late.
Treat your Windows CDs/DVDs/ recovery disks, etc.. just like you would a $100 bill, because that's about what it will cost you to buy a new Windows setup if you lose your original disks.