How do I free up space on dvd/cd rw D drive

Be aware that writing direct to CD-RW by formatting it for "packet writing" and using "drag-to-disc" is the most unreliable form of writing to CD and often results in data loss after only a few weeks.

It's much better to use normal burning software like Nero (or one of the free equivalents) and even better still if you avoid using re-writable media altogether.