The heightened security in Windows XP Service Pack 2 causes this error.
To workaround this problem:
1. Open Component Services from Control Panel / Administrative Tools, or Start / Run / control admintools / OK.
2. Expand Component Services / Computers / My Computer / COM+ Applications.
3. Right-click your COM+ package and press Properties.
4. Select the Identity tab.
5. In This user: under This application will run under the following account, type into the User, Password and Confirm Password fields.
6. Press OK.