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Guys does anyone knows why I got Exception 6 trying to run my code at my new PC, AMD Sempron3000+ 64bits 754pin mobo?

at other´s pc it runs, something like duron, athlon 32bits one, intel P4

intel p3 k6-2

its odd

could anyone help me? I´m using software taskswitching

Exception 6: Invalid Opcode Exception

So you use an opcode which is not valid on your AMD64 anymore, just add a breakpoint into your code and watch which statement is causing the exception