Solved: BIG PROBLEMS Cant log on to windows

ok when i start the puter is starts right starts windows and gets to log in screen and thats it!! when i try to log on i get this even in safe mode (((( cannot log you on now because the domain ( computer name) is not available))) i cant get in to do anything !!!
can anyone help with this ?? i really dont want to lose all my data

 

i guess you need the windows im using sorry its windows XP sp2

 

ok had to reinstall windows