cendyne 48x12x48 problems with Mac OSX

[p.diniz]

All,

I recently bought and installed in an external USB enclosure a CenDyne CD/RW drive (38x12x48).

At first it worked just fine on the Mac. Then I used it on the PC and now it does not work on the Mac. Says Driver not found!!!

Any experiences like this? Any fix

Thanks

Pedro