[Raver]

I know this problem has been discussed here many times but I didn't find any solution by checking old threads.
I am running calibre on win 11 since years without any issue, suddenly today it won't let me add any new book, it don't let me choose even the source file as it is in not-responding mode for some time before giving the error message. I just updated Calibre but the error is still there.
I have Norton 360 (but I have it since months without problems and calibre is on its white list), just to be sure I disabled it but nothing changes. I tried to disable also DrDrm plugin with no success. I don't have any windows firewall or defender active, no Onedrive active.
This is the error message that I get, I hope someone can give me an hint.
Thanks
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calibre, version 7.5.1
ERROR: Unhandled exception: <b>Exception</b>:File dialog failed (return code 3489660927):

calibre 7.5.1 embedded-python: True
Windows-10-10.0.22631-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.22631')
Python 3.11.5
Windows: ('10', '10.0.22631', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre.exe
Successfully initialized third party plugins: DeDRM (10, 0, 3) && Manage Series (1, 5, 2)
Traceback (most recent call last):
File "calibre\gui2\actions\add.py", line 564, in add_books
File "calibre\gui2\__init__.py", line 945, in choose_files_and_remember_all_files
File "calibre\gui2\win_file_dialogs.py", line 268, in choose_files
File "calibre\gui2\win_file_dialogs.py", line 209, in run_file_dialog
Exception: File dialog failed (return code 3489660927):

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