I don't believe acer has free downloads of the stock recovery image they made for you. You can either order one from them or reinstall windows. But you would need a windows dvd/iso in order to do the reinstall.
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.
1. Power on the computer
2. At the white ACER BIOS screen, hold the Alt key and press the F10 key simultaneously to start Acer eRecovery.
3. Once eRecovery has loaded, click Restore to Factory Default Settings
4. Click OK to continue
5. From here, the eRecovery process will update all the data on the C: drive and restore a fully functional factory image (approximately 10 minutes).
6. Once eRecovery has run, press OK to reboot unit
Note that all data will be lost during this process and your computer will be brought back to it's original factory state and settings.