Most likely driver issue (ATI, Intel with not fully current drivers) or to lazy to install DX and asking himself why it does not work.
You can tell him what we suggested here and report back afterwards.
PS: another reason it might not work are missing DLLs if you used userlibs. Or if he is a "cool one" using an illegal version / outdated demo. Both will not work, you need at least Blitz3D 1.87 for Vista / XP with enabled bitexecute extension
You can tell him what we suggested here and report back afterwards.
PS: another reason it might not work are missing DLLs if you used userlibs. Or if he is a "cool one" using an illegal version / outdated demo. Both will not work, you need at least Blitz3D 1.87 for Vista / XP with enabled bitexecute extension