The Acer comes with a recovery partition ...
and unless you have deleted the partition it should still be there.
To start the recovery process:
1 Restart the system.
2 While the Acer logo is showing, press <Alt> + <F10> at the same time to
enter the recovery process.
3. Enter the password to proceed. The default password is six zeros.
4. In the Acer eRecovery Management window, select Recovery actions and
5. Select the desired restore action and follow the onscreen instructions to
complete the restore process.
Step 3 might not be necessary on some models.