beasue your windows is a copy or the windows key dont works windows will stop and block more and more tools and some other windows files like the runtime library on your pc so you cant play samp any more you need a working key or you musst reinstall windows lots of my friends had the same problem sorry
No, it's not the only way. Delete gta_sa.set from \My Documents\GTA San Andreas User Files\ folder and if that doesn't work then create a new account on your OS.