The problem is that you really want the path from image to light projection to be as free from modification as possible. The path of greatest success has been for people using Intel graphics with the projector’s default settings, which produces a projected image with minimal digital image processing.
The problem users have reported with NVidia and ATI cards is that there seems to be no clean path, somehow the drivers always do something to the image that can mess with the black levels.
The methods of working around this issue have been best discussed in:
In general they involve adjusting the light path through a combination of control panel settings, projector settings, and physical lens filters.
If at all possible, those of us who have had the best experience printing have found some way to switch to using Intel based graphics, either by switching to using a motherboard on-board graphics chipset or by switching to a dedicated computer like:
http://www.amazon.com/gp/product/B00O65HZKS (which @Joshua uses)
or:
http://www.amazon.com/gp/product/B009TLA7P4 (which I use)
both of which are similarly priced used or refurbed.
Personally, I like the tablet because then have zero change of accidentally curing a mouse cursor.