I can somehow not post a reply in the original topic
Yet, I feel like helping, so I try it the alternative way :-)
My replay to the topic would have been:
I was faced with the same message, time and again.
Searching the internet, I came across a similar problem, and I ‘translated’ it successfully onto my problem.
The following steps solved it for me:
1. I made a full image of the entire SSD holding the existing Windows 7 programs, etc. (using Acronis 2015) (onto a separate HD)
2. Then I made a new map ‘Safety BU) in C:\
3. I restarted my PC from a Knoppix boot disk (Linux; Ubuntu would do equally well)
4. Removed the other 2 files $Windows.~BT and $Windows.~WS (temporary roll-back files ?), but left alone the $~Recycle.bin
5. Then I went to C:\Windows\System32\DriverStore\FileRepository, and searched for the files, holding any ‘acs6nts’ in its name. There was only one: acs6nts.inf_amd64_neutral_16a4f72f419e5ed1.
6. I moved it to the map ‘Safety BU’ in C:\, and kept it there (just in case ).
7. Note well: all this was all done in a Linux-environment.
8. The I restarted the PC, booting into Windows again. It did perfectly. Doing so, it showed a quick message; something like ‘auto installing pci - pci bridge. OK’. Never seen before.
Having gone through all this, the actual upgrading W7 to W10 went smoothly.
You may give it a try (AFTER GOING THROUGH STEP 1 FIRST !!!).