Have just upgraded to BD 2010 from BD 2009. Build 13.0.19.347 on XP Home SP3 Dell machine.
Since upgrading I have found that frequently the PC will freeze, but disconnecting the network cable allows the machine to recover (ie a reboot is not required) and continue as normal. This is an intermittent fault.
I have disabled Active Virus Control and now run with it disabled for a while without any repeats of the above problem.
Seems to me to be yet another AVC issue (amongst many).
Why have you made this product so complicated? Sometimes more is less!