Shotty sound quality CE7.

Ok, So I have Elements 7 on two separate computers. My desktop is a PC and I have Cubase running great and sounding great. I decided to also get it for a laptop which is a Mac(it was my fiances so it was free). I installed and everything and started setting it up. Right away I noticed that things where labeled differently. I use a Lexicon Alpha interface. When I try and use a instrument track it only comes up with “All MIDI inputs” when trying to select the input for that track, and nothing for output. When I put an audio track I can get my mono in and stereo out, but the quality is crap, very grainy and staticy. I have it set up the same on my PC and it is completely different. I accept that I could have just set it up incorrectly, but I really don’t know what to do. I have been messing around with this for day to no avail. Any help would be appreciated.

Thank You.