Thread: screen freeze

ive had my htc desire for about a month , everything was working perfectly until yesterday. then when i tried to open my music player all i got was a black screen and a locked up phone. this happened a few times which i got around by taking the battery out and now the phone is just freezing randomly, also all my pics have disappeared and the phone gets very hot when being used or is charging. ive tried searching but cant find a solution , any advice would be very welcome. thanks