Sometimes restoring your computer back to manufacturer specifications is inevitable and we know sometimes these discs get lost or misplaced. Luckily, the manufacturer can send you a copy.
Most manufacturers will need your model and serial number to send you the correct discs. Dell will need the Service Tag and Express Service Codes. Generally, you can find the needed information on the bottom or back of your computer. Check under the battery as well.
Choose your manufacturer from the list below and either visit their support site or call them for instructions on odering.