I unpacked a UPX packed executable with changed headers and screwed up IT, I dumped, fixed everything, it didn't work, at first I was thinking it was my fault, but someone did the exeact same thing and it didn't work here as well.

OS: WinXP pro with all the latest patches/updates

prob bad import.

nah, you didn't understand it
same file, working in personB computer, not working in my computer

different os or not?