Start your drwtsn32.exe set it to make logs, dump symbol table at least 10 instructions and dump thread contexts.
THen start io and check the logs. This should give you a clue. io runs on many many computers so there is something wrong on your machine.
Alternatively: startup ioftpd with a debugger and just check where it crashes then disassemble some of the code near 0x00030013 and see what is in that area, that should give you a clue as well.
Thx buddy that helped ...
i figured out that ioZS caused io to crash all the time, it seems to have a problem with handling like 10+ users uploading into same directory ... zipfiles and mp3 ...