Hello friends, I want to say that I am using this notebook from last year and I noticed that in this notebook I put in 10 to 15 time windows. In this notebook no one genuine window I put in window 7 , 8 , and 10. Window 7 and 8 32 and 64 bit both I tried but after a month notification come to replace window because of some criterion that was I not understand why it happens that’swhy it waste to buy.