i think you can, there's a so called PS2 to USB adapter but most of the time it's for keyboards, so if you wanna use a usb keyboard (and you dont have usb ports) u use that adapter .
i have never tried inserting other devices in it but im guessing it shud work but then again you have only 1 PS2 port on your PC so you have to remove the keyboard while you try it
i think it will work