I can't run corel draw 12

I have been using Corel Draw 12 for a year without any problem, however recently I did a Norton antivirus installation and now  I can't open the program. When I click Corel Draw from the computer desktop, appeared a message which says unable to create a DOM document. Class no registered. Verify that MSXML4 is installed. I really don't know what to do. I contacted Norton and they were working to fix the problem and they can't. They suggested to contact Corel.

Please provide assistance on this.