I had a hard drive failure and reloaded Vista Ultimate signature back onto the new drive. I kept getting invalid product code (it was def. the one on the box). Yesterday Microsoft informed me I would only have limited functanity and it would cost £109 to sort out as they longer supported Vista. I said all I needed was a new product code, but they refused. Et voila my PC today can only access the internet for half an hour at a go. ANy advice on this? 
