I FOUND A SOLUTION!!
In my previous post I tried the
regsvr32 method. I was able to "un-register" it but was unable to re-register it. Finally I found a solution.
It seems a lot of people encountered this problem after uninstalling Norton Antivirus. You can find a fix for this by doing this:
1) Go to the
MSXML 4.0 Service Pack 2 page (it's from the Microsoft web site so it's safe).
2) Scroll down about half way and click the "Download" button for "
msxml.msi".
This is a Microsoft Installer. It's only about 5mb so it won't take long. After it downloads just open it up and run it selecting "Install".
When it's done and you click finish nothing else will happen, but that "msxml4.dll" file will be repaired.
Immediately after doing this I tried to open my CorelDraw X3 again and it worked. If you're having this problem and haven't found a fix yet please give it a shot! It'll only take you a couple minutes.
Good luck!