You need to start the On-Screen Keyboard
If you can’t write at the moment (no USB keyboard worked for me), just search for On-screen keyboard by copying the words from this page.
Then you need to start the registry editor, and as before you can copy regedit and search for it in Windows.
Backup or export the registry before doing any changes.
Navigate to this KEY:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Contro l\Class{4D36E96B-E325-11CE-BFC1-08002BE10318}
Find UpperFilters, of the type REG_MULTI_SZ. You may have to manually create the key if it does not exist. Edit the value UpperFilters to read
kbdclass
If you find other text in this field, delete it and click out kbdclass. Click O.K. You may get a warning but accept that and move on.
To fix the mouse follow this:
Navigate the registry to:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Contro l\Class{4D36E96F-E325-11CE-BFC1-08002BE10318}
Find UpperFilters, of the type REG_MULTI_SZ. You may have to manually create the key if it does not exist. Edit the value UpperFilters to read
mouclass
If you find other text in this field, delete it and click out mouclass.
Exit the registry and reboot. This restored keyboard and mouse function to the laptop.