This problem is because when you are running Thay Co program in your computer, there is another running program interfered with Thay Co. Follow these steps to solve this problem:

1. Open VNI Tan Ky option dialog box

2. Check off "Run Thay Co 2001" feature.

3. Delete VNI shortcut icon in the Start up folder.

4. Restart your computer to activate the set up.

5. After your computer restarted, there is no more Error message appeared.