No need to start two threads about the same issue, please read the forum rules
about multiple posting. I merged your threads.
Most eMachines have a recovery partition. Like already said you should be able to start the recovery process without any CD by repeatedly pressing some key at startup, probably F11.
When a brand computer doesn't come with any recovery disks there's usually a preinstalled program in the start menu that allows you to create the backup/recovery disks.
If there's no such program and you can't find the proper key to press at startup to access the recovery partition then eMachines should send you a recovery CD for free (or just shipping fees) if you contact them.
If the e-mail form doesn't work there are other ways of contacting them :
eMachines - Telephone Technical Support
Customer care representatives are available 5 AM to 12 midnight PT seven days a week.
United States 408-273-0888*