Is the file you're trying to open read only?
Right click and try Run As Administrator.Sometimes you have to do that even if you are already administrator
maybe a server is already running or it depends on what the file is doing stuff
no
like is the file locked or something like thattry redownloading the server/.exe
where is the .jar that you're launching?
in the same folder as everything else
okay but i mean where is that folder?desktop, documents, etc