Windows 7 comes in two flavors: 32-bit and 64-bit. This page was made with the 64-bit version in mind, but these directions should still work for the 32-bit version.
When installing Windows 7, create a hard drive image file that is at least 20 GB in size. This would create a 50 GB hard drive image file:
qemu-img create -f qcow2 "Windows 7 HD.qcow2" 50G
qemu-system-x86_64 -hda "Windows 7 HD.qcow2" -m 3000 -usb -device usb-kbd
-device usb-mouse -device usb-audio -localtime -boot c
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