Swap to SSD

I just got a new SSD for my system and I put Windows on it to boot off of and got all the boot stuff working, but how do I get rid of Windows off of the old drive while still keeping my stuff? I can't move the things I want to keep on the SSD then wipe the old hard drive because there is too much stuff and not enough memory. Anyone have any ideas?

Seeing as how you cant clone the HDD to the SSD due to memory sufficiency. Just install all your major software's and drivers you use on a daily basis like your graphics driver mobo chip sets, favorite browser, editing software, etc. Maybe a few games as well but its always better to keep a good amount of it free if at all possible.