so I just finished recording and mixing a bunch of songs on my computer useing a really nice microphone and cakewalk guitar studio software

the songs sound great when I play them in cakewalk, but once I export them to wave or realplayer sound they sound lik absolute sh*t and its incredibly frustrating, the tones change, there's tons of clipping and distortion etc.

im really mad about this what can I do? is there a program that eliminates this or anything?