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Anna, what is the combination you referred to?

MAME/MESS/UME: GCC 4.4.7/Python 2.7.3/Qt 4.8.4
QMC2/Qt CHDman:GCC 4.6/Qt 4.8.4

These combinations work for me.
Just for info, I have an Intel Mobile Pentium 4-M processor.
OS is WinXP Pro SP3 32-bit