aaah ok. i thought of stuff like memory-hackers (DMA stuff), which could be blocked in vista and that this app here "hacks" the memory of other programs, too("before size-4" could mean that 4 bytes are even written to another program, not only wrong written in this program). well, i know that memory accesses to other programs even with self-written programs arent blocked in XP (i wrote my own-> didnt work really well

), so i thought it should be a vista-only problem. but i think your idea makes more sense and the most important thing now is that it works on (hopefully) all the machines!