I am running Windows 8 , and I want to format the C drive and only use a single OS (Ubuntu) run in my computer.
I did install Ubuntu alongside Windows and it install and take more time so I shutdown the computer directly.

I opened Windows and it reduced my windows drive (C) size and not join again with C drive again try to install by selecting something else  

and to delete c drive and install in c drive bt message display on screen 

**No root file system is defined. Please correct this from the partitioning menu**

What do I do ?