OPC Problem under Win XP SP2

Hi all

I'm trying to connect 2 Computers with WinCC V6.0 + SP4 under Win XP SP2 by OPC but It doesn’t work, I keep having an error saying The OPC Server does not support browsing interface or can not connect to OPC Server. On the event viewer from the OS it says DCOM got error "Class not registered " from the computer pt100705 when attempting to activate the server:

{75D00BBB-DDA5-11D1-B944-9E614D000000}

I have already formatted the PCs and installed only the Win XP + SP2 and WinCC V6 + SP4 but always the same problem.

I have the same users and user rights and no firewall or virus scanner installed on both PCs.

I have tested also with an OPC client from Kepware connecting to WinCC and I have the same problem.

I have tested connecting the WinCC by OPC to itself to the internal tags and works fine.

I have tested with WinCC V6 + SP4 under Win 2000 Server + SP4 and works fine (with same installation options).

Do I need to configure something or install anything else on the Win XP SP2?

Any ideas?

Thanks

Strange why the WinCC installation does not configure this automatically, it should do this!!!