Don't try to upgrade from Windows Update. Just don't. It'll fail. Something is borked with the download process. It'll probably be fixed in a week (or even today, maybe), but for now, to be on the safe side, just go to this link - https://www.microsoft.com/en-u... and download the ISO. Then burn it to a DVD or install it onto a USB drive of sufficient capacity, and away you go. Not sure if it would work if you mounted it to a virtual drive, but worth a try.
I updated 3 systems (a 3 year old desktop, a 2 year old laptop with hybrid graphics, and a virtual machine in VMware on a 4 year old craptop) and did not have any upgrade issues. The only problem I had was on my desktop, where I would occasionally get a MEMORY_MANAGEMENT BSOD when viewing the start menu, until I updated my AMD Catalyst drivers to the latest on the AMD site.
Some more pitfalls:
- If you have exotic or rare network cards, graphics cards or printers, you may want to hold off to see if people with your hardware have similar problems.
- Is your GPU (graphics card, whether it's on the CPU, on the motherboard, or an expansion card) *more than* 4 years old? If so, you may have some problems, especially if it's by Intel.
- Do you have any programs installed which install custom software into the OS kernel ("kernel modules" / "drivers")? Things like: virtualization software (VMware, Virtual Box), VPN software (OpenVPN, SSL VPN clients, etc.), certain audio / video production software, etc? If you see anything in Device Manager that isn't actually a piece of hardware and sounds like it's associated with a program you have, chances are good that the answer is "yes". You should really consider uninstalling these programs before you upgrade to reduce the potential for incompatibility in the kernel. Then you can try to install them after the upgrade is complete, where the driver will hopefully fail to load "gracefully" and error out of the installer if it turns out to be incompatible.
- Is your system *extremely* "hacked up", with extensive deep-running customizations to the UI, .NET framework, kernel, or other things like that? You should probably not attempt an upgrade, especially if the vendor/developer of these changes is not a well-known commercial entity with an established footprint.
Summary: If you have a computer that was purchased new with current-gen hardware within the past 4 years, and you don't have anything more than web browsers, office programs, and games installed, you should have no problems upgrading. If you have a much older computer, your risk of breakage is higher. If you have deep customizations to the OS, your risk of breakage is higher. If you're in doubt, hold off until others with similar configurations try it first and report their results. But for the love of God, use the ISO, not Windows Update, to upgrade.
This scares the shit out of me, a guy with almost 30 years of programming experience. What the hell is Grampa supposed to do?
Well, not me, I mean my grandpa. My proverbial grandpa, my real ones died before I was born. My in-law, let's say, or dad. Ok most of them are dead, too, and I guess I am the patriarch of my family now.
Ok, grampa and expert computer programmer are merged now. I do not want to burn CDs, or type on command lines, or go get drivers myself for freaking major party 3d cards. If I don't wanna deal, what is grandp...nevermind.