I had this problem aswell...stuck at 1 second. I forced shut the update program by task manager in windows. I unplugged the device and tried to start didnt work.

I then saw that the update program gave me a message that i could plug in the device and it would "recover" it....it said this can take up to 15 minutes. I did connect it again and waited about 5 mins and all of a sudden i had a full working n900...updated and all.