Epson r1900 and Windows 8

Last week I had to replace my dead PC with a Dell XPS 8500 Special Edition, containing Windows 8.  Finally got everything installed, Photoshop CS5 and Lightroom 4.2 included.  I went to Epson's website and read how to install 1900 on Windows 8.  However, my prints are turning out so inconsistent.  I calibrated the monitor, but that didn't help.  Sometimes the prints turn out 'ok' and sometimes they are so murky and dark.  I have tried letting Photoshop control the printer, letting the printer control, different profiles and it just isn't good.  I tried printing from Lightroom, but that was even worse. To test, I printed from my laptop with Windows 7/Photoshop  and exceptional photos with the Epson printer.  I also used my new PC to print to my HP all-in-one and those pictures turn out great.  So it has to be the printer and Windows 8.

Has anyone encountered print problems with Windows 8?

Thanks!