System information
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how to know whether user's system is win 7 32 bits or 64 bits ..
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I don't think there is a Qt-ish way of determining this information at runtime, but you might use native code instead, like "GetNativeSystemInfo()":http://goo.gl/lR0f4.
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Do you want to know what the OS edition is (if so, do you just care about Windows?), or wether your program is running in 32/64 bit mode?
Second is easy using QSysInfo::WordSize, for the former you need OS-specific code (uname, Get[Native]SystemInfo, ...)
