Did a fresh install of windows 8.1 last week then upgraded to W10 at the weekend, everything seems fine, is a fresh install a must have W10?
Just means a couple more hours work really
Cheers
You don't mention if this is on a fairly 'standard' desktop PC, or a laptop, but if it is the later, and you have a 'clean' Device Manager, with all devices and drivers recognised, and with no dreaded 'yellow triangles' I would personally strongly recommend that you don't!
IMHO you are far better off, tidying up your existing installation, and leaving it at that.
Having recently upgraded a new Asus Laptop from Windows 8.1 to Windows 10, on-line, I then decided to do a clean install using the official Microsoft Media Creation Tool.... as I am legally entitled to do.
I first found that the trackpad and keyboard were unresponsive, which required the use of a USB wired mouse, and than that a number of essential drivers were not immediately installed, and despite many hours 'Googling' and installing a variety of driver from Intel and other sources, I am still not able to get it to recognise everything, although it does at least 'work'. However Microsoft then insisted that it was an unactivated product, which required me spending over an hour and a quarter on the phone to them, to rectify the problem.
Personally I wish I hadn't bothered, although I am sure there are others who have not had any problems at all.
You have been warned!

Edit: Plenty of other comments already I see, with some good advice from 'MOOGLEYS'!
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