The manufacturer was required to provide a way to reinstall Windows.
If a set of disks did not come with the computer there will be a hidden Recovery partition (not to be confused with System Restore) you would use to return the computer to OOBE (Out of Box Experience) state.
Usually, just tapping F11 continuously while the computer starts will bring up a boot menu offering the option you require.
Restoring the computer to factory condition with install disks:
Dell - Creating Your System Recovery Discs with Dell DataSafe Local Backup 2.0:
Dell - Request Install Disk:
<<http://support.dell.com/support/topics/global.aspx/support/dellcare/en/backupcd_form>>
UTC/GMT is 08:10 on Tuesday, June 05, 2012
