iTunes 6 Music Store account not working with iTunes 7 Music Store - help!

I have an account with both the apple site (for here) and for the itunes music store (and i have a current credit card on my account). when I upgraded to itunes 7, it says i do not have an account now....even tho it says to use your apple login (which i've always used to download things from itunes music store), it comes back and says i have no account....

why is this happening? is this a bug? if you have to recreate the account, shouldn't they have said something oremailed something to tell me that/????