is there a driver to let a ps2 keyboard plugged in with a usb connector work on my macbook pro 13inch

is there a driver to let a ps2 keyboard plugged in with a usb connector work on my macbook pro 13inch?

I know there are more threads about this subject but none was really an answer.

I got a keyboard (brand medion) with a ps2 connector. i wanted it to connect to my macbook so i bought an ps2 to usb connecter.

wile connected with my macbook the keyboard leds flash one time like they do when you put it in a ps2. but after this just doesn' t work

I think i might miss a driver or its just turned of somwhere in the system. an previous answer was said something about a safe reboot and a lot of codes but thats to hard for me.

so any good solutions????