'Error 1928. Error registering COM+ application

Hi!

Little help needed...

This is my environment:
Server: Windows 2003
Client: Windows 2000 and Windows XP

I've created and exported my msi package on the server for COM+ ver.
1.0 due to the backwards compatibility (win2003 has COM+ ver. 1.5).
I installed it on the win2000 client and it works fine.
Then when i tried to install it on the winXP client I get the error
'Error 1928. Error registering COM+ application. Contact your support
personnel for more information'.

I need this application proxy to work on both win2000 and winXP...

It would be great if someone could give me some hints!

thanks in advance!
/Magnus