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PC will not boot after installing latest MB Premium

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I downloaded & installed the latest version of MB Premium to my Windows 10 Home PC on Wednesday August 22. I  then ran a full scan with the updated database , no threats found. Since then, the machine will not boot. It hangs on the Windows login screen after entering my password. I tried Safe Mode, same thing. I tried System Reset, Repair, Restore (no restore points found), all unsuccessfully.

Any assistance resolving this issue would be greatly appreciated.


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Thanks for the reply Devin. There is no other user account on the machine. Just mine. I tried another normal reboot, it hung on the login screen for quite a while, now a black screen with this text message:

"Reboot and select the proper boot device or insert boot media in selected boot device"

Sounds like a corrupted OS to me.


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If dcollins has any other ideas then please follow his advice, however given your description of the errors and behavior, it sounds like it's possibly corrupted boot files/partition table or even a failing drive/bad sectors/data corruption which is along the lines of what you theorized as well.  It could even be a simple matter of a bad connection, but then it likely wouldn't consistently get to the login screen like that so I'm betting more on the corruption side.  Registry corruption is the most likely culprit or corrupt/missing boot files/system files in my opinion.

Your best bet if you have files on the drive you can't lose that you don't have backed up elsewhere would probably be to do a repair install of Windows, that way it keeps the data and just repairs/reinstalls the OS/system files and registry.  Most of your installed software should still work afterwards, but some may not since they might not be able to recreate necessary data in the registry, so those that don't work will need to be installed again after the OS is back up and running.

Instructions on performing a repair install can be found here as well as here.

Specifically with regards to Malwarebytes' role in all this, it is very unlikely that performing a scan, especially where no threats were detected, would cause corruption of the system so I suspect the timing was just a coincidence and that something else occurred during the last shutdown that caused this situation (anything trying to write to the registry during shutdown and failing to complete on time could cause it; this usually occurs during power loss events, but it is possible during a normal shutdown under some circumstances as well).  If you have an SSD it may be even more likely as certain settings designed to protect data which might result in slower performance might be disabled for the sake of speed.  Once you have Windows up and running again you can check by right-clicking on Computer in the START menu and selecting Properties then clicking the link for Device Manager, locating your drive in the list of installed devices (it should be under Disk drives if you expand that section), double-clicking on it (or right-clicking on it and selecting Properties), then looking at the Policies tab.  Ensure that the first checkbox Enable write-caching on the device is checked (it sounds counter-intuitive given what it mentions about power loss, but for SSDs this does actually need to be checked/enabled) and that the second setting Turn off Windows write-cache buffer flushing on the device is NOT checked (this is the one likely to cause issues like this with SSDs; it has been known to sometimes improve performance, but it has also been known to cause corruption in situations like this during shutdown when it isn't able to complete an operation resulting in corruption of data).  Also, if you haven't already and you do have an SSD, I would highly recommend installing the drivers for it from the manufacturer, especially if it is an M.2/NVMe SSD as the native Windows driver is notorious for causing issues with the more modern SSDs, including data loss and slow performance and I'd also suggesting checking to make sure that the management software (if available) from the manufacturer is up to date along with the drive's firmware (they should all be available from the manufacturer's support site but if you need help finding them, let me know what model and manufacturer your drive is and I'll do my best to locate them for you).

Edited by exile360
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