Formatting help?

[Yucca]

If this is in the wrong section please move it.

I am trying to install windows on my pc on a 300 gig hard drive. But its got a partition. So its 200gig on one and 100 on the other. The 200 gig partition is full of data so cant delete it as i need the info. I want to install windows on the 100 gig partition. But windows keeps making the data partition the c drive and wondows partition as a d.

How can i change this so wondows is c and the primary partition?

 

[Yucca]

I made the partition on this drive using windows on another drive as i used to have two hard drives.

So there's no way of changing it now?

 

[Yucca]

Yes but you cant use that to change the letter of the windows drive?