Problem installing Campaign Jena-Auerstaedt

[Mesquite]

Well, I just bought the game and I guess I screwed up on installing it. I have Windows 8 and when I inserted the disk and started the installment process everything at first seemed ok, but then when the installment bar came up nothing happened for awhile and so I thought I'd start over. Stopped the installation and then tried to restart. I get as far as it asking me if I want to install the game and then nothing. I found that the start menu had the game there as if it was installed and the directories were created on the drive, but they were empty. I deleted all that and looked in the registry and found keys for the game and deleted them. Still the game won't install. I'm thinking that something is telling the install program that the game is already installed and so it quits. Anyone know what it could be?