Really good machine for the $. Not much preinstalled garbageware to get rid of.Windows 7 update completed without headaches.Expansion should be no problem. 2 extra power adapters for another optical drive and hard/ssd are already in there. Small board in a big box makes it easy to get to everything.Comes with a Windows 8.1 install disk but not Windows 7 so creating them is highly advised before playing with the settings. Takes 4 blank dvd's or a flash drive.