Notebook Video, Display and Touch

I installed some updates recommended by Windows the other day, among them two ELAN updates.

Right after the update the touchscreen function did not work anymore.

Also, sound does not work: the icon is crossed out with error message "no audio output device is installed"

The HID compliant touchscreen driver was found among the ghosting devices.

As per a suggestion on a MS or HP board I uninstalled this driver and restarted the notebook.

I also performed a hard reset.

Microsoft support spent 3 hours on it yesterday but could not get the drivers reinstalled.

There is also the suggestion to update the BIOS, however, when I start its update, I get a message that Bitlocker was active and I should write down the code number. There is no BitLocker on my notebook and I had this problem before after an update: afterwards the whole notebook was blocked. Back then, the HP support could help me but I am understandably reluctant to go through this problem again.

To make things worse, for some reason my Windows system hasn't created recovery spots, so I cannot set it back to an earlier moment.

Any help would be greatly appreciated.