this is a special case I can't test and don't know the cause.
I have not a 64 bit machine neither have the windows 7.
but I think it's worth some further testings.
for example, try adding the `Goto x86_Target' command after the `:x64_Target' label line in the commands.txt file for testing build with 32 bit libs on your 64 bit machine.
Don't forget to run the install.cmd again after modifying the commands.txt.
I have no many more ideas.
I think you can build Qt on a 32 bit machine with windows xp or vista and use it on your 64 bit windows 7 environment too.
and I think you can contact qt software sending your error message too.
probably they will give you some useful information (if so, please don't forget to post them here too).
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