According to http://forums.linuxmint.com/viewtopic.php?f=90&t=135834#p727923 it is possible:
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Long answer: (Mint remains intact)
Boot to the Live mode using your thumb drive and run the partition manager. Be sure you don't click your hard drive in the file manager so that it won't be automatically mounted.
Open the partition manager (I think it is Gparted) and you will see there the partitioniner. Shrink your current Mint partition and Hit Apply Changes.
If your not familiar with it,
read http://www.linuxbsdos.com/2012/05/17/ho ... windows-7/
or this http://www.dedoimedo.com/computers/dual ... buntu.html
After creating paritions, install Windows 7 on your newly created partition. After the installation of Windows, you'll lose the ability to boot Mint since WIndows 7 blows you boot record.
Next step, boot into Live mode again and follow this tutorial to recover you operating systems.
However, I'd hate to try this and find out that it actually doesn't work.