Black screen with cursor immediately following Windows logo

That's what the instructions said to do--to upload the .zip with everything. Did you want me to upload the dump file separately?

I tried the clean boot, which made a slight difference. I was encouraged to see that after the Windows logo disappeared, the cursor had a blue "thinking wheel" next to it. However, then I got the same "Failure to configure updates... Reverting changes" message that I got when trying to roll back the updates. After this finished, though, I got to the login screen and was able to log on. The computer is still painfully slow when not in Safe Mode (and a bit slower even IN Safe Mode), so I know the problems aren't fixed.

At least now I have a way other than running System Restore that manages to coax the system through that place where it tends to get stuck. Time will tell if it's reproducible.

I am sorry if I confused you, I didn't check the zip file. You don't need to upload anything else if it is already from DM Collector.

Progress is good though :) Is it slow even after desktop loads and can you describe the slowness? Are the programs slow to react even after they start or just during startup? Open a Resource Monitor and sort by a relevant column in CPU, Memory, Disk tabs (in CPU tab check both Processes and Services). See if anything is consuming a resource higher than usual.

Also try to login with another user account - User Account - Create

It is mainly, possibly only, the file system that is slow. Therefore, the slowest operation is opening an application by double-clicking on a file name--I assume because then both the executable and the input file need to be fetched from the file system/disk. This goes for both third-party programs and ones that come with Windows, like the photo viewer. Opening a program by clicking on its own icon is a bit faster, but still slow.

Even browsing through directories without actually opening any files is slow. This is true in Windows itself, but I especially notice this when running a program written mostly in Python that uses its own kind of file dialogs (which are not the same look and feel as the ones generated by the OS)--it takes 4 or 5 seconds just to browse from a folder to one of its subfolders.

However, ordinary processing, even on computationally intensive tasks, runs at normal or near-normal speed. The only thing that doesn't is certain Flash animations--but I wonder if those might have to read and write from disk too.

Did you try checking HDD health with its manufacturer's utility yet?

I did try checking the disk with a utility provided by Lenovo (since it's a Lenovo laptop). No problems were found.

How is the analysis of the dump coming along? Are you waiting for someone with more debugging experience to come onto this thread?

Upon some inspection, it may be better if you can re-run the DM collector as it will update startup list etc. Run it in normal mode (as Safe Mode throws errors in Event Viewer for not-started services)

You mean after causing the BSOD again?

I re-triggered the BSOD and collected another dump. Here it is...Driver BSOD dump2.zip

Bah, this one is not complete, kindly see the zip contents of both dumps you posted, most of the report is missing (happens sometimes).