Boot from a flash drive or CD until you become comfortatable with it.

The zone of anxiety you are in will not help your creative flow.

You need to partition the drive to make room for the program (there is a chance of data loss) and you need to configure your boot loader. It is easiest to do this with a clean system or just add another drive. 13 GB is recommended for Knoppix. It will attempt to find windows extentions