I double checked, It's AIR v33.1.1.744 so it's not the problem.
I desactivated Iobit Malware Fighter, it changed nothing.
It's in fact an admin account so it's not the problem and all files are on the pc.
For my different try, I put the folder on desktop so it's easier to find when trying again.
I tried to make a new gallery, it works now. (It didn't at first)
Seems I have to make new gallery to upgrade the Juicebox-Lite one to the Pro version.
(I already changed the jbcore folder as said in tutorials)
I now seem to have a solution even if it's not the fastest one, haha. Thanks :)