Yes, but it requires another machine or hard drive.
- Another machine approach: Get partitioning software (I recommend Partition Wizard) and section off enough free space (About 40-60GB) and install windows on that partition
- Another hard drive: Just install Windows on that
Keep in mind that all of your activated programs and settings won't work until you either reactivate and reconfigure them. You might
be able to save the settings, but activation is another matter.
EDIT: Actually yeah, that doesn't solve your problem. If you can't get into the Windows install those programs were activated on, you can't deactivate them.