I have recently installed Win7 in my lenovo laptop. So, I could make 2 drives and one of which has got win7. Now as I want to create more disks, I first shrunk the drive from 300 GB to 100 GB. 

Now I have 200 GB unallocated disk space. So, when I am trying to create new disks, its showing me error "Unable to create disk." I am aware that they are dynamic disks.

Why that's happening? and how to solve.
After creating dynamic disks, I would like to make them as basic disks. How it is possible?