register pc with old existing hotmail account or restore new account i previously cancelled

Hi ,

I bought a new pc and it asked me to register to Microsoft and I created a new account not realizing I could have used my existing Hotmail account. Every time I logged into my laptop it would automatically link me to this new account that I was not using and I would have to sign in as another user; so to avoid this I cancelled it. This apparently was not a good plan because it is still tied into my computer. So I either need to restore the new account back or I need to somehow reconfigure my laptop to accept my old Hotmail account. Is there anyway I can reregister my pc or again restore the new account. Please help!