An error occurred registering the forms in the OLE Registry

Description: User gets error message " An error occurred registering the forms in the OLE Registry" when trying to create an appointment in the Outlook calendar

[SWE] "Det gick inte att registrera formuläret i OLE registret"

Cause: Problems with the usrclass.dat file in path C:\Documents and Settings\- YOUR USER-\Local Settings\Application Data\Microsoft\Windows

Solution: Reboot machine and enter safe mode. Then delete or rename the Usrclass.dat file. Reboot into normal mode and the problem should now have disappeared.