My comuter crashed. it would

Question

my comuter crashed. it would only let me restart it told me about loosing everything but i did it anyway. i didnt care about the stuff i had in there. but when i went to turn it on again i got (windows error recovery) i hit start windows normally and it let me do the (set up windows) but it keep's stoping in the middle of the prosess. so finally it let me do the whole thing and froze right at the end. now when i turn it on it want's me to keep doing the (set up windows) but it tell's me that the user name is already there and wont let me go any further