Hello all. Would appreciate a bit of advice please. I have installed Win7 Enterprise on a blank new disk. My old Vista C drive is now my D drive after reformatting and is used for storage of documents and movies etc. I want to use Win7 Backup to backup my System (C) drive to an external drive, and not to back up my D drive that way. Along the lines of making an image using Acronis True Image in case of total drive failure or a virus. I back up my D drive separately elsewhere.

My problem is that Backup sees both my C and D drives as system drives, and won't allow me to uncheck the D drive. I assume this relates to this drive being the old C drive and the settings were not altered by reformatting.

Does anyone know how please to make this D Drive a non-system one in Windows 7 so that I can backup only 'C'? I cannot find any way to change the settings.
Many thanks.