I have run my Virus scan BD TS 2012 for the first time.
I observe that from time to time my PC is not reponding and that the Virus scan is also waiting , the Files per second becomes 0 and we wait.
In Task Manager (Win7 Pro X64) only the vsserv.exe and the odscanui.exe processes are changing (increasing) value for I/o reads and writes.

Hope it helps