Hi Kevin. My name is***** you for your question and the opportunity to assist.
Can you tell me the model number of your Acer?
In order to boot from a recovery disk BIOS changes are required
on most Acer models.
Thank you. Since this is a desktop the BIOS may not need to be changed.
Put the first recovery disk in the drive and restart the computer.
As soon as the Acer logo appears on screen begin steadily tapping the F12 key at the top of the keyboard.
This should bring up a page with a list of startup options allowing you to select the CD/DVD drive.
Once selected press enter and the machine will boot from the disk.
Keep an eye on the screen while this is happening as you may be requested to press
any key on the keyboard to boot from disk.