Windows 10: Win10, Mouse and Kb not working in Windows - works in BIOS screens

The fix for this problem might be available somewhere in this Forum.
I had a look around but have not come across it.
On Win10, my son's desktop has all of a sudden stopped recognising the mosue and keyboard.
They work within the BIOS screens which tells me it is a Win 10 bug.
I have gone into recovery screens and there the mouse and kb also work.
I have removed kb and mouse drivers that were not windows (at some stage my son had a razer mouse and a kb, so I removed those drivers through command prompt
Problem not resolved.
Reloaded Win10 - booted all the way through to the sign on screen but KB and Mouse still not working
Did it again - Went all the way through to the sign on screen and got message You do not have Administrator permission or something to that effect. Tried a few suggestions, like going into the Reg files and changing the admin reg file but that made it worse because after doing this I could not get into any screen in recovery mode because of "No administartor defined" or something to this effect.
Have now reloaded Win 10 the third time. This was was a complete new install, removing all files and apps, etc.
Boots all te way to the sign on screen but thel KB and Mouse still do not work..
I am thinking that this might be malware which is somewhere deep in the HD mening that I might have to reformat the hard drive.
Is this the correct approach or is this maybe a known problem, and I am missing something someone else might have already resolved without reformatting the HD?
Your help highly appreciated.
Regards.
R

:)

 

Win10, Mouse and Kb not working in Windows - works in BIOS screens

The fix for this problem might be available somewhere in this Forum.
I had a look around but have not come across it.
On Win10, my son's desktop has all of a sudden stopped recognising the mosue and keyboard.
They work within the BIOS screens which tells me it is a Win 10 bug.
I have gone into recovery screens and there the mouse and kb also work.
I have removed kb and mouse drivers that were not windows (at some stage my son had a razer mouse and a kb, so I removed those drivers through command prompt
Problem not resolved.
Reloaded Win10 - booted all the way through to the sign on screen but KB and Mouse still not working
Did it again - Went all the way through to the sign on screen and got message You do not have Administrator permission or something to that effect. Tried a few suggestions, like going into the Reg files and changing the admin reg file but that made it worse because after doing this I could not get into any screen in recovery mode because of "No administartor defined" or something to this effect.
Have now reloaded Win 10 the third time. This was was a complete new install, removing all files and apps, etc.
Boots all te way to the sign on screen but thel KB and Mouse still do not work..
I am thinking that this might be malware which is somewhere deep in the HD mening that I might have to reformat the hard drive.
Is this the correct approach or is this maybe a known problem, and I am missing something someone else might have already resolved without reformatting the HD?
Your help highly appreciated.
Regards.
R

 

Win10, Mouse and Kb not working in Windows - works in BIOS screens

Have you booted your system from a Win 10 install disk? If so, you would have had to use your mouse and keyboard then.

Try using USB 2 ports if available.

If you have access to another PC you can create one:

Top 5 Free Rescue Discs for Your Sys Admin Toolkit

Bob.Omb's Modified Win10PEx64 - Best Rescue Disk 2018
Toolkit Item: Kyhi’s Rescue Disk – Win10.Guru

Try:
Go to BIOS to Enable the USB Legacy Support
This feature allows users to use USB mouse during the system startup. You can enable it by
1. Turn on the computer and Enter the BIOS via pressing the functions key(s) once you see the PC brand logo screen.
2. Use the arrow keys and the Enter key to find out the USB Legacy Support feature. Enable the feature.
3. Press F10 to save the changes and then boot into Windows 10.

See:
Fix: Mouse only Works in BIOS but Stops Working on Windows 10 | Driver Talent

and there are plenty of threads on this topic if you search for
mouse and keyboard only work in BIOS

 

Win10, Mouse and Kb not working in Windows - works in BIOS screens

Do you mean you used one of these options?
Reset Windows 10

Suggest you try
Clean Install Windows 10

Sorry about suggesting the device manager- knee-jerk response. There are ways of checking if drivers are present offline, but not worth bothering with here.

If you have a live boot disk, boot the PC from that and check the devices work.