C program from win98 env to win XP

first of all, i'm not a c-developer, just a user of a program written in c. this program (some years old) has been running within a win98 very well. i run it within a win2k env and it still runs well.
but another user runs it within win xp. the problem with this is that it takes a long time to start up. when it finally is there it works okay. the program is not recompiled for the several env's (is it necessary?).
has someone any idea what can be the cause and/or (maybe) the solution?
thanks in advance.
kind regards,
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