Avast 5 and Remote Desktop Connection

[ibot]

First sorry for my bad english.

Now, i have a pc with WinXp Sp3, Office, etc, and Avast 5.1.889, beford RDC, with Avast 4.8 work fine, but now, if need use RDC, Avast block and it's impossible connect.
I think the problem is Avast when disable, all shield for 10 minutes, the connection work fine.

Thanks a lot.
Regards,
Martin.-