trouble with athlon

trouble with athlon

my code works fine on intel processors (133, 400, 2.8GHz) and different versions of visual fortran (5.0, 6.6), i always get exactly the same output, the only difference between output files (compared with windiff) being blanks.
unfortunately when i run it (with some particular set of input data)on an amd athlon 1000MHz processor it gives some wrong numbers. actually, if i run it with a debug configuration it gives the right answer only if i activate the run time/floating point underflow setting. anyway this does not help in the release configuration and it crashes all the time with a message 'error(65): floating invalid'.
i would appreciate some suggestion of what might be the problem.

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