As mentioned you can buy a new cam (single) and ilder wheel, new string and cable, and maybe new limbs. What you'll have then isalmost as muchmoney in parts than it would caost to buy a new bow already rigged up that way. And you'll still have a 7 year old bow.
You would be better off to check the classified here and at
www.archerytalk.com for a good used one a couple years old.