Yeah, the C that you wiped is now shown as D, 137 GB, and empty.
I assume you have a valid install disc and don't care about anything now on that entire hard drive?
If that is the case, do the install over.
Delete all partitions in the process.
You should end up with 2 partitions: C of around 149 GB and a little one called System Reserved of 100 MB or so.
You have passed the point of no return---you can't go back to Vista unless you have Vista disks of some type.