partition

Is there a way to partition a drive after installing windows, I haven't built a comp in 2 years and I partitioned a space for Windows but forgot to partition the other space . Is it too late to partition that space?

You want to go to start>run then type "diskmgmt.msc". Once it opens, you will see the unpartitioned space. Through the menus it will give you the option to allocate the space and format it to your liking.