I have Windows gets paid 6 years 7 Pro. Runs today after 6 years without crashing. Had me one with Windows 7 Professional version with Service Pack 1 had bought for 138 euros. SP1 I was unable to install the same. No idea why. If I already umsteige on something new then Windows 10. Windows 8 was scrap. Saves you money. Previously, I had years Windows XP Professional 2 times and Home Edition or Windows 2000 PRO. I am very satisfied with Windows 7. Why always something new if you do not necessarily need ??