Installation issues

Hi,

I have two drives on my laptop, C - 118 GB (System drive), and D - 917 GB (data).  My System drive is running at max, and ideally I want to run my CC software from the D drive.  I have changed the windows settings to set the D drive as the default location for all apps downloaded, but when I try to then download CC and associated apps in continues to download to C drive.  

I have had a look on CC and tried to change the drive location for downloading apps as well but it won't let me and remains on 'default location'.  I had hoped that would be the D drive, to match my windows settings, but it isn't. 

Any help gratefully received. 

Thanks

Martyn.