As-tu essayé un Ctrl + Alt + Suppr au démarrage?
http://www.youtube.com/watch?v=CwWW1AigMCE&feature=related&ytsession=QIvHt69ydSTzBxyxMMUwSFbHRzFpfDpxNeD-LolhII3AbQBIAZMrLqCc6wADkYSNfrbgiBWKYhZJ2YpTZ1lk0BN50Np8dQin0dlYynzXYEIKDEeprRsqY2eIBRPBvLLsye_1aQkl1kCsZIzIY-_-51ycI22jGdQU-FplaKeLaWZ1SaAKBQjt_CobSKTeZudKXP-FoYdZzGyLq4aXI2RpA6Dx7aBIQtxPKQ23Bjk-C1P0xcQW7pwy80ht8K5ZEwj24yw7ORETfB04KW_xJH4LTNgAMQ3Qv_e6hjp0l1Ib1ao