I followed the tutorial up and went spectacularly well (I installed Widows 7 Ultimate 64-bits and OSX Lion on the same hard drive). Notebook model: ASUS G51JX-SZ062V Core i7 720QM + Geforce GTS360M + 8GB DDR3 1333 + 640GB HDD I have yet to install some programs and then I will test the OSX Lion. If I detect any problems I will put here to see if it is possible to solve. Thank you "Pein" Ps. Sorry for my English.