I had pointed out to the user in my reply to the comment above, that the root cause is the end of Adobe Flash support at the end of 2020.
The strange f and i looks like in the picture here. Since then, the Solution Center can no longer be started. Since a Win 10 update in Dec 2020 an image file is prepended 'f u. HP Scan Jet 3800 has worked smoothly with Solution Center even on WIN 10. Then German blog reader Waldblick left this comment.
Someone mentioned issues with the HP Solution Center starting in January 2021. I first came across this a few days ago on Twitter in a private conversation. And since January 12, 2021, an installed Flash player has stopped working. But support for Adobe Flash is scheduled to end at the end of 2020 (the announcement was made back in 2017). The problem is that the HP Solution Center relies on Adobe Flash to function.
scanning functions for all-in-one multifunction printers (see the following screenshot). The program is still installed on many systems in 2021, as it provides e.g. HP Solution Center is a printer management program for HP printers developed and released by HP before 2010.
