also if facing activation or origin error
1) turn of all anti virus [EVEN WINDOWS DEFENDER](most important)
2) Changed the resolution to its highest.
3) Ran it as administrator.
4) Changed the compatibility to windows 7.
5) TRY WINDOWED MODE
also, first disable ur antivirus AND DEFENDER and than download crack sometimes antivirus automatically deletes the files (without permission) even though the files are not a virus and needed for working of fifa 15