Differences in Windows

I might be behind the times here, but can anyone tell me this? If I currently made a program on Win's 98 operating system, and then installed it on me, 2000, xp, will the program crash? I'm using Inno setup. Please let me know.
Thanks
Dan Regalia ([email protected])

Unless you are using some very specifc api calls that are not multi platform, you should not have any problems.