iTunes account possible problem

I just tried to purchase an album from the store, but after submitting my username and password the store said I was making my first purchase from this computer. I have made tons of purchases from the store from this computer in the past with my i.d.. Why would the store be telling me something that is totally false? It wants me to resubmit and answer security questions.

I am totally confused. Any answers would be helpful. Could i be getting hacked for password data or am I just being overly paranoid?

Thankyou all.