I'm running Windows 7 Ultimate 64bit and have AutoCAD LT 2011 loaded. When I do the plotter wizard to install my Kip 3100 plotter, I get an accessed denied error. I've tried loading in from several locations, even off of a thumb drive that I loaded from XP. So, I don't think it's necessarily a Windows issue. However, I have installed 2011 LT on my XP machine and had no problems loading the driver. Has anyone else run into this issue? I'm also wondering if there's an issue with the driver itself, so I will also be contacting Kip.Thanks for any help you guys can offer.