1) What displayed "error 1304" and when? --> During LibreOffice installation or desinstallation.
I MADE A MISTAKE, IT WAS ERROR 1402 :
"Error 1402. Setup cannot open the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\SharedDLLs. Verify that you have sufficient permissions to access the registry or contact Microsoft Product Support Services (PSS) for assistance"
2) What version of PowerTools you used? --> I think it was 4.0.0.1477
3) What tools of PowerTools did you use? --> Clean and fix, strongest
4) Did you try to restore the backup created by PowerTools? --> no, because too many backups, couln't remember which one was the good one
5) Do you still have the backup(s) created by PowerTools? --> yes
I did a Drive Image backup I made before cleaning, and it came back OK, I could install LO.
I think JV16PT made bad to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\SharedDLLs