A:AnswerThree ways. Either through yearly subscription for Microsoft 365, you can migrate eligible MS Office products from an older machine, or buy a CD.
A:AnswerI understand the latest Windows versions to apply to 1 PC at a time. 2007 you could; however, that is a software related issue and should be directed to Microsoft.
A:AnswerNo. If you read my review, you can see me go on a tangent of how installing a GPU in this PC is not possible unless you buy an aftermarket power supply unit. You need at least a GTX 970 or similar minimum, preferably even a higher powered card to do VR as it gets more advanced.