Windows Vista error "user account not loaded properly"

ok so i'm just happy with my new windows vista home premium laptop but on the third day when i try to log in to my account it has none of my installed sofware on it and it has a message saying "your user account was not loaded properly you are in a temperary account any changes you make will be lost once you sign out, for more information view event log or contact administrator" and the administrator account loads just fine... it's just mine that does not work, i have tried rebooting but that did not work PLEASE HELP!!!!!!!!!

P.S. it was working earlier today too, my brother had access could it have been something that he did?