Could be a few things : 1) Service Pack 2 may do this if u install it and it detects you're using a dodgy reg key. 2) a virus could do it if it fucks your registry - i've got a 'work around' for getting rid of dody keys which involes giving it a new activiation code and fiddling in the registration - a virus could also easily do this. Best bet - soon as u turn it on, after the black bios screen PRESS F8 - u should get a start up menu - see if i lets u go into safe mode. Once there, try the system restore............. Other thing to try - google for the message you're getting - see if other people are having similar problems! on that screen u get - there will be an option to either do 'registry by phone or internet' - if u do it by phone - there is then a place where u can type in a new licence key.
