how to factory reset old laptop (Toshiba portege r) ?

[volterhortelano99]

i tried pressing 0 with power button F8, F5 , F2 all F keys yet no warning for factory reset found
can be fix or not? and how to fix
( i need to reset it because my COOL and HANDSOME friend use his USB without my permission and thanks i got a AWESOME virus thank you) forgive my grammar

 

[rgd1101]

there is no factory reset on old OS. buy a recovery disk from toshiba, if they still support it.