Thanks.
There is a bug when running the latest MTA server version on Windows XP/Vista
Until we fix it, you'll have to use an older build: https://nightly.multitheftauto.com/mtasa_xp-1.5.3-full_rc-10575-20161013.exe
Note: The client from the older build will not function correctly, so Install into a separate directory, e.g. C:\Program Files\MTA San Andreas 1.5 OLD and only use it for launching the server.