Windows 7 64bit & SMS 2003 Console (Remote Control) to WinXP Clients = "Security Context Problem"

Hi all

Our IT using now Windows7 64bit Clients. The rest of the domain users are still on WindowsXP.
I've installed on our SMS2003 Server ServicePack 3.

I'm able to load the console on Win7, see all the clients, select a XP machine, start Remote Control - but then when i try to connect i got the following error:  "remote tools cannot establish a security context"

anyone knows how to fix this?

thanks!