Windows 10 free upgrades.

Yes but Microsoft help desk wont tell you about it I found a link to it on another site.

The chat tech told me it was impossible to do since July 29 so they must be trained by Telstra.
Know nothing. deny everything else LOL

There is a vast difference between the free UPGRADE and what you did with an ISO I also have 3 different version ISO's.
However the machine I upgraded had a backup but we were unsure how much it had done so did the Upgrade which just replaces Windows and your computer is the same as it was but has Win 10 on it . As you say using an ISO is destructive and you lose everything unless you have a full backup
In your case I would have backed up to a different drive and formatted the C drive prior to reinstalling windoze. That way all the crap is gone completely.
You can export your contacts as a CSV file or even a WAB file and import them back after a reinstall.
I use a program called Fixit utilities to clean out my machines. Ran it on the one I was upgrading and it found 1377 errors in the registry and nearly 400 broken shortcuts.WIn 10 free upgrade is NOT now easily available and was quite hard to find and may not be around for too long. It is supposed to be for people with vision or hearing difficulties being able to access the stuff that they have left out of Win10
On installing Win 10 it implants a digital signature in the Bios which identifies your machine and if you change the motherboard you have to ring to get windoze reactivated. Been there done that a few times

You could have used an ISO and the serial from WIn 7 or Vista and it would accept it Would have been free.

I have been running W10 on 2 computers for well over 12 months now without any problems at all but then again I use Google Chrome as my browser.
This is one of the best and stablest systems Microsoft have brought out.
I still run W8.1 on my laptop but not for long now that I know I can still upgrade to W10 for nicks.

Only thing I did not like was the default setting to make updates available to other PCs on the internet - no wonder my usage was sky high. Now I update to my desktop PC and then make it available to my other PC's on the LAN, setting all other PC to metered.

Its not hard to do a google of .0003 secs showed this
Turn off Windows Updates in Windows 10. You can do this using the Windows Update service. Via Control Panel > Administrative Tools, you can access Services. In the Services window, scroll down to Windows Update and turn off the process Otherwise do as I do let it download updates but it has to ask me if and what to install I then go into it and disable the optional ones that are the likely ones causing problems EG the NVidia one at present.
I agree about Edge although it has got better I hate Chrome for the way it lists your history. Thousands have asked for it to be done similar to Firefox but Google always knows best, to their detriment.
Have had intense trouble when streaming and Chrome cant find Flash
I wouldnt wait too long to use that upgrade as it may be withdrawn at any time
.Going to the temple of Apple is a bit drastic after reading the article about how Apple are out of touch with what users actually want.

In my business I've probably seen 2000 Win 10 computers and a hell of a lot of unhappy people. I haven't put it into many business customers yet because it would be a complete nightmare. Latest stats show that win 7 is still outselling it but MS is withdrawing it. I've actually lost count of how many people have asked to have their computers wiped and put back after the grace period. If you think there are no problems then that's great.

" Via Control Panel > Administrative Tools, you can access Services. In the Services window, scroll down to Windows Update and turn off the process"

What version or Win 10 are you using? I have the anniversary update done to mine and there is nothing like that on my Control Panel.

Win 10 Home Premium Amin tools are in all versions. and were in win 7 also
I have since seen its only doable in Pro but appears in mine

So I assume the new PC had W10 installed on it?

Yeah it does but it's factory installed and shouldn't suffer similar a fate.

You could have done a format and fresh install for a lot less than a new computer.

Would have given the same result

Ah good excuse to update the PC anyway eh? New one is lightning fast compared to the old one.

Will be until you add all your little programs off the net which while they work on their own, sometimes fight with each other.

Another thing to speed things up is always do a custom install and turn off the "Start with windows"

I then go to my start menu via "msconfig " and turn off all the ones you cant select when installing. Makes things cleaner and meaner.

Tried a win10 update 6mths ago...crashed the laptop, had to pay a repairer to get it going again....so no win10 for this laptop....

Next laptop maybe, but just because its new, doesn't mean its best ..

The original GUI of windoze was first on the Atari. Then it reappeared in Win 3.1 and so on. I had Atari's, a 400 an 800, a 130XE and a 1040 Shame they are gone, they were great gaming machines in their time. Had several hundred games for them as well, on tape and disk