Same problem over here!
Avast 4.6 home edition
Build mar2005 (4.6.623)
Xtreme toolkit version 1.9.4.0
Using Active Skin version 4.2.7.3
Frequently I get this 0x7c910e03 error from ashServ.exe at shutdown. It pops up over the blue shutting down screen.
Often, XP does not power off the machine. Don't know whether this is related to the ashServ problem though.