May be this is an old issue, but its giving me much trouble. I am using Visual studio.net 2003 enterprise architect on WinXP SP2. The .NET framework 1.1 (SP1) is installed. But whenever I try to add any COM refernece on the Form, it says that 'The type library wrapper tool tlbimp cannot be found in this system', but I searched for 'TlbImp.exe' and is installed in my system. I searched the MS Knowlegebase and found that this problem is discussed there and it is due to SP2, it says that the workaround is to install .NET Framework 1.1 (SP1). But it is also installed in my system and didn't help. Is there any solution to this problem or do I have to uninstall SP2?