Satellite A300-1ND (PSAGCE-04700CG3)
Best to restore the hard disk to its original out-of-the-box contents using Toshiba recovery media. All of the drivers and utilities will have been installed. Windows is pre-activated; so no product key is required.
See the section Restoring pre-installed software from your created Recovery Discs on p. 3-10 of the User's Manual (attached).
If you failed to burn the discs, order them from Toshiba.
Toshiba Europe Backup Media Online Shop
-Jerry