Sound Of Records

I have a system inherited from my aunt that has never been used, the CD player and Tuner sound great, however when I put records on (several, new and old) I select the speed for 33 and the music is really slow and voices distorted, if I put the speed on 45 the music sounds somewhat more like it is supposed to but the voices sound like chipmunks...I see no other way to adjust the speed, my records are 33, I put some 45's in as well and have the same problem. What can I do to fix this? Am I going to have to buy a new turntable? If so does it have to be the same model to work with this system? It's one of those in the cabinet that all come together (CD, Tuner, Tape deck, receiver, and Turntable) Please help I desperately want to hear my vinyl again it's been years!