I have the exact same issue. Happened about a month ago, I tried everything - to no avail. I got this reply:
Thank you for your mail. Please try this: unplug the power from your Virus TI and remove any other cable going from/to the TI. Wait approximately 1-2 minutes. While plugging in the power into the unit again, hold down the EXIT button. This will force the unit into USB UPDATE MODE. Next try again to load in the very latest OS with the help of the "Virus Control Center" application (do not mix this up with the TI Control PlugIn) and check if this helps.
But it didn't help...
Oh well!