Reply to Hercules RMX and Traktor 3 Crisis !! Please help!! I have to play live shows soon !!!

I used to have a Sony Vaio , it crapped out on me. So I had to buy a new computer

Asus 3gb , 2.2gh intel, windows 7, Traktor 3.2 , and Hercules RMX 10ms latency.

My old computer was nothing special. Under 1gb , Windows XP , don't remember the gh.. I'm not very techy. Had it running 21ms latency.

But here's the problem I'm having..
On the old computer, the hercules sounded great, traktor ran fine, and sounded good weather using 1/4" or RCA outputs..

Now, traktor runs fine, sounds good out of the headphones, but the output sounds a little distorted - especially in the low end. If I use an aux cord from the headphone jack and plug it into my speakers everything sounds just as clear as they do through the headphones.. But when I use the 1/4" out of either output 1 or 2 , it sounds just a little crackly and rough.. Output 3 isn't as bad, but still not as clear as out of the headphone jack. I tried lowering latency, and other settings, but it just sounds a little distorted.

What could be the problemo?? I have 3 big shows coming up, first being June 19th - and I'm a little freaked out that I can't figure this out. I need this new setup to sound clean..

PLEASE HELP !!!!