I thought with a new computer that would be okay.
A new computer makes no difference at all.
You need a monitor capable of 1920x1080 resolution or greater.
Otherwise use the low resolution version.
If you bought directly from
http://www.mdna-games.com/Shades/buy_dig.htm you should have gotten an email with links for both high resolution and lower resolution graphics.
The lower resolution version is for monitors with a resolution between 1280x720 and 1920x1080.