I recently had problems with Cinnamon DE and I had to temporarily download and install gnome3, which then altered the login screen a little. After I fixed my cinnamon problem and removed gnome3 I'M still stuck with this other login screen that I don't like as much as the original cinnamon login screen. Any idea on how I might get the old one back?

One more thing, I'd like to add my Windows 7 that's on another HD it grub. At this point I'M not asking how to do that right now I just need to know how to find out what HD and partitoin the grub is on the is booting my system now. I have a feeling that it's not the grub that's on my Mint Linux system that I normally use.