Thanks for your reply !
I was able to make my way to the directory (by showing hidden folders)
But there was only one file (lwprotect.lwd),
I deleted it an reinstalled but I still have the same issue
I found the same file there again and also in the folder where lightworks is.
The "???" represents the folder name of the account you are logged on to Windows with. C:\Users\???\AppData\Local\VirtualStore\Program Files\Lightworks Please make sure that you have deleted the files from the correct folder and that after reinstalling Lightworks you started it by right clicking the shortcut icon and selected "Run as administrator"