How do I force MSIexec to use C:\ as ROOTDRIVE instead of picking "Drive with the most free space"? I have a content hard drive with lots of free space (D:\). I use it in conjunction with my media player. MSIexec uses and abuses my poor hard drive, leaving MSI**.tmp folders all over the place and not deleting them. My hard drive is very sad, as its root should only have one or two folders, and instead has 10-20 of these temp folders at any given time. How do I disable this "feature" of MSIexec, and override the default value for ROOTFOLDER? Thanks, Avi P.