If your particular eMachines model didn't come with recovery media or you just misplaced the disc, you don't want to be caught without a means to restore the operating system. It's all too easy to accidentally download a virus or experience any number of problems that make your computer unstable. However, there is an option for restoring your computer without the original recovery disc by using the pre-installed recovery software.
Use an external memory device such as a DVD, flash drive or external hard drive to back up the data you need to save from your eMachines computer. Any data that isn't saved to an external source will be erased when the computer is restored to factory settings.
Remove any discs that are in the optical drive and unplug the computer's peripheral devices, such as an Ethernet cable or scanner. Do not disconnect the keyboard, mouse or monitor.
Click the Windows "Start" menu and choose "All Programs."
Navigate to "eMachines" and choose "eMachines Recovery Management." Click the "Restore" tab.
Click "Password Settings" if you have not already set a recovery password. Type a new password in the text box and click "OK." Click "Restore System to Factory Default."
Type the recovery password and click "OK." Click "Next" to wipe the eMachines computer's hard drive and begin the recovery process.
Select "Finish" and wait for the eMachines computer to restart. Use the series of installation prompts that appear on the screen to create a new user account for your operating system, set the system date and time, and set up your internet settings.
The eMachines Recovery Management program also allows you to create a new recovery disc. Insert a blank DVD or CD into the eMachines computer. Navigate to the "Backup" tab instead of the "Recovery" tab. Click the "Create Factory Default Disc" option and follow the instructions on the screen.