To print you halftone RIPed color separations from CorelDRAW first click on the print icon or go to file and print. Under the General tab set the print range to pages and start with page 3 because the orginal is on page 1 and halftone preview is on page 2. So you would start printing your separations from page 3.
This CorelDRAW video tutorial will show you how to repair you CorelDRAW installation. Much easier than uninstalling and reinstalling CorelDRAW.