Danny, I had the same problem a while back.  I would quote Michael Breed and tell you to 'go see your local PGA professinal'.  There are so many things that could be, I wouldn't dare to give you advice.  Personally, I found that all of the gadgets that say they will get rid of your slice don't work.  I had a half hour lesson with a local pro and he told me what to work on to cure it.  Sure enough, it helped quite a bit. 

Seriously take a lesson!  I was a 12 handicap, and I had a debilitating slice.  Took an hour lesson from a PGA pro and now I hardly slice at all, and when I do it's manageable.  I tried tons to tips from magazines, web videos, and good old Golf Fix on GC, but nothing worked.  I was amazed at how easily the Pro fixed my slice.  I can even hit draws now.  "Take a lesson" was the best tip I ever got. 

Like was already said I would check with a local PGA professional.  Focus on a good setup and I would bet that will help a little bit in going in the right direction.

I agree. Setup is so important! Go get some help from a good pro in your area. And here's a good tip of advice. Stop reading all the tips in GOLF magazine and GOLF DIGEST. Alot of these tips in these great golf publications dont do anything except make people worse. I have subscriptions to both and read the stories and other articles and basically just look over the rest.

I agree with everyone else about getting some lessons.  Without seeing your swing, we are all just speculating as to the cause of your slice.  The most common cause would be that you are coming over the top.  If this is the case, one of the more popular drills that most pros will have you do is to work on an exaggerated Figure 8 swing path, dropping the club to the inside.  They want to make sure that you are coming into the impact area from the inside of the ball.  Picture a clock, 12 to 6 would be the target line; imagine the club coming in from about the 7 o'clock position.

Hope this helps

Most already had said it, but I would stand behind the lesson. In the least, get a swing analysis so you can watch yourself and how you address, swing, follow through etc. 

Good luck!

My natural tendency is to hit right to left, a baby draw.  A couple years ago I started seeing a left to right fade which then turned into a wicked slice.  I started trying different things on my own but I knew that something had changed in my swing that I just couldn't figure out.  Went to my pro and he told me that he made his easiest money correcting slices, he said he'd fix the problem in 15 minutes or less.  He did just that.  I hit two drives, he made a change in my shoulder alignment and that's all it took.  See a pro, those guys are good at fixing things that we just don't realize we are doing.

I had the same problem one thing that really helped me is to put a tee about 1 foot in front of the ball and a little to the right of the ball and when you swing try to swing out to the tee. 

Also you probably have your driver closed setting try to set it in neutral or even open and it will help putting the draw spin on the ball.

I hope this helps it helped me.