Windows 10 problems with KB4549951 update get worse

KB4549951 BSOD

Most Windows 10 bugs are minor and can be fixed through
restarts or subsequent updates, but there are serious issues
like Blue Screen of Death errors caused by the Windows 10
KB4549951 update.

On April 14, Microsoft started rolling out Windows 10 KB4549951
for version 1909 and 1903. This patch was supposed to bring a
number of security fixes and it was also supposed to be a minor
release with focus entirely security-related fixes, but
KB4549951 leads to dreaded Blue Screen of Death and system

If you’re getting a blue screen on your PC after applying
recent Windows Update, it’s not just you and the issue appears
to be widespread. The Blue screen does give users general stop
error codes, but these stop errors are complex and there’s no
specific pattern, which makes it essentially impossible to
understand the cause of the mess.

After deploying KB4549951, users have reported the following
BSOD stop codes:

  • Portcls.sys

It’s common to see these error codes as a result of damaged
installation files, drivers, and third-party security
software compatibility issue with Windows 10.

Some users are also reporting a loop of Blue Screen of Death
and complete system failure.

Until Microsoft issues an advisory or a hotfix, your best bet
is to uninstall the Windows 10 April 2020 cumulative update and
it’s worth doing, even if it means that you won’t have latest
security fixes.

If you’re unable to access the desktop, you’ll need to get into
Safe Mode to make those changes happen. First and foremost,
hold the Shift key while clicking Restart and get around the
boot menu, and then go through Troubleshoot > Advanced
options > Startup settings and click on ‘Restart’.

In Safe Mode, you can head to the Control Panel and safely
uninstall the patch.

File deletion bug

If that wasn’t bad enough, the update also appears to delete or
move files for some users.

In some cases, users are reporting that their documents,
pictures, files and personal settings were removed after
updating their devices to Windows 10 KB4549951.

This appears to be a return of an old issue where Windows 10
boots with a temporary user profile which removes settings,
some files, and icons from the desktop.

“This update is a disaster. It deleted my files, pictures,
documents saved in system drive and as well as my apps which I
downloaded from Windows Store,” one user wrote in our comments.

“I guess this latest update happened last night. I switch on
this evening and all my personal settings are deleted. No
bookmarks in Firefox or Chrome. I don’t want Bing or Internet
Explorer. Wallpaper removed,” a user documented a similar issue
in Microsoft’s

“Windows 10 is unable to locate system default user account
after installation of KB4549951. This failure has occurred for
the last 3 cumulative updates so they were each unistalled and
hidden,” another user noted.

“Data lost after upgrading [to] KB4549951. All files in
Documents more than 1 week old are deleted without notification
or moving to the Recycle Bin. No restore available, no help, no
live chat, no nothing,” writes a frustrated user.

“My system automatically updated on the 19th of April. I lost
some important word files of my university. And a folder. I
have looked on the temporary folders and I have tried to
uninstall the update but they do not appear,” another Windows
10 owner said.

There are even some problems with the system performance, to
add to this nightmare update.

Microsoft has yet to comment on these new problems, and as we
stated so far it seems like uninstalling the update is the best
and safe solution.

Let’s hope the company takes its time ironing out issues before
releasing the next major Windows 10 update, which is expected
sometime in May.

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