Cannot install Windows 11 - Error 0xc1900101

I had the same issue. It was just about to complete the update, but then it restarted back to Windows 10 with the 0xc1900101 error in Windows Update. Tried a myriad of things. In the end one of 2 things resolved it for me. I say this as I did both at the same time before I tried the update again. PITA but better than wiping and starting over. I disabled bitlocker and cleared the TPM in the BIOS, and disconnected the monitors from the nvidia quadro card and used the onboard intel display. Tried update again. Success. Re-enabled quadro card and reset Windows PIN and turned bitlocker back on.

I fall back to my prior speculations. Microsoft has taken the position that the configurations of power users, is way too much work at this stage. Baby steps, with simple configurations, then more complex, then a little more, then finally to the types of computers actual DEV level Windows Insiders use.

I just tried dot 120 with no luck. Poop. Short for Pre Optimized Operating Platform.

Ensure you have secure boot enabled in your bios or it will cause this error.

I very much appreciate your comments. I have an external M3 that I will clone from the internal M3.

The primary obstacle / challenge I'm facing is that there is in excess of 750gb of data and 30+ applications to contend with. No one is a big fan of moving a train load of data and most certainly not reinstalling dozens of applications. MS is a bit grumpy about licenses being 'used' too many times.

I enjoyed the way you smacked MS up side the head. Politically correct or incorrect. I hope I don't hurt their feelings.

I have a Ryzen 7 3700U CPU with Radeon Vega Mobil GFx video in one of my laptops, and Windows 11 upgrade it from 10 to 11 without a problem.

NOTE:

All of you people who do not want to install via clean install, there is another option for you guys to use if you're still interested in running windows 11. If all you have is 1 hard drive, you could repartition it into two drives, then install Windows 11 on the new partition clean. Once you do that, Windows will automatically create a boot menu to allow you to dual boot between your Windows 10 with all your apps installed or your Windows 11 that is clean. at least if you do this, you will find out for sure if it's a hardware issue (if it fails the install) or a software issue, (if it doesn't fail). This way you're not having to re-install all your other apps to get back up and running. To go back to Windows10 simply reboot your machine and select Windows 10 instead of Windows 11, as your boot partition, and away you go, to be productive again. It's not the perfect workaround, but it'll at least give us an idea of where the problem is, you'll get to check out Windows 11, and you won't have to re-install all your apps again. Besides that, when moving up to a new O/S it's always best to start it from scratch, as to not carry over any software issues, to begin with.. And it'll probably be valuable information that Microsoft can use to help them solve their install problems. if it works or if it doesn't, either way, it would benefit Microsoft to know.

If you have more than 1 hard drive, then it is even easier, just select another drive to install Windows 11 onto. Just make sure you have enough free space for the install to complete. There's a way to make a USB install disk with Windows 11, from a Windows 10 USB stick. I've seen it on "youtube", not sure how the product code question will behave, if it'll nag you for a code or not, however. The trick is you have to already have a Windows 11.iso copy. With all these customers of Microsoft having these issues, perhaps Microsoft will allow an. ISO release of Windows 11, to get those who are stuck, unstuck? So how bout it Microsoft, if you're listening, how about providing us with a .iso of Windows 11?

Also, there is word going around that there is a .dll file in windows 11 causing a bunch of problems named appraiser.dll that if you simply copy the windows 10 file over this file it fixes a lot of issues? It's mentioned real quick in a youtube video so check it out and see if it helps. Look up (how to clean install windows 11? It also explains how to make a clean install of windows 11 but you have to get your hands on a windows 11.iso file first. So this won't work for those who can not obtain the .iso. Seems to me if you have a windows 11.iso file you should be able to perform a clean install with it, without having to modify it, but I guess not.