Found it be caused by a McAfee file, and update one I think? See https://community.mcafee.com/thread/74287, been around for awhile. Not everyone gets it either.... :(

This was an upgrade over W8.1.

Only basically happens once, shortly after booting. Only time Thunderbird came to the front was when I was doing a reply. Otherwise I can't tell where the focus...

I'm also seeing something stealing focus, but only ONCE after booting.

I too could be browsing something and all of a sudden the mouse wheel no long will scroll the page? Clicking on Firefox will...

I don't think missing files is the reason. VM's virtalize the h/w so it doesn't look the same.

Any DVD created under UEFI BIOS should work. Have you tried just copying the non-bootable DVD to...

I had a similar problem with a different DVD that was made on a different computer on my Dell 8700 with a UEFI BIOS and Secure boot. BIOS did allow a CD/DVD boot as I was able to boot the Win8.1...

Rich, a few reasons not to... McAfee at least can only be disabled but comes back on during the next boot. If you want to stop it totally during the install and re-boot you must UNINSTALL it. L's PC...

No, Active. W10 installed fine on the hard disk's C: partition with McAfee in full operation.

Problem is getting the present SSD C: on the hard disks C: partition and THEN upgrading to W10. One...

A/V was active on the hard disk when I installed there, so it isn't a problem. No Stardock s/w.

I need the state the SSD is in. Could care less about the hard drive C:. All I did was populate it...

I suspect "Sorry, not our problem"!

In the Dell forum it turns out a few have the identical problem, all on SSD's as the boot drive.

L's XPS 8500 as it turned out DID install W10 to the SSD...

I guess you missed it 'Z'...

Yes, I've got back-ups of both C:'s. Using Symantec System Restore 2013 (I hope this works on W10, it is expensive to get new versions for 3 systems). Others in the...

Well I read the link and although it is for a slightly different error (40017, not 20017) I did Method 2, the clean boot.

Failed as well...

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I'm going to try the UPLOAD tool, but I...

Full message on screen, "
"We couldn't install Windows 10. We've set your PC back to the way it was just before you started installing Windows 10. 0xC1900101 - 0x20017 The installation failed in...