I am trying to install Morrowind and it is forcing the directory to be my second hard drive, i want it to be my main hard drive,

how do i get it into my main hard drive it is not offering a change path.

Did you have MW installed on this system previously and was it installed to the second drive? If so, there's probably a registry entry with the original location. You'll need to search the registry and delete it. To do that, run regedit and search for Morrowind. Repeat the search (F3) until it displays a page with "Install Location". Delete that line and you should be good to go.