Hi,
You haven't installed a new HDD?? Lol.
An update from SKY wouldn't normally cause these errors. How do you know you've had an update? What was the update?
You haven't had an earlier problem and called SKY CS who have talked you through a system reset etc.? This would delete all information on your HDD. It warns you of such when you attempt this.
Cheers,
Cofnchtr.