Windows Update nightmare...

[Vince]

If Lenovo still have it remove the determanistic network enhancer on the network adapter. Restart the machine and give it another bash.

 

[firewallblocked]

If windows had failed to install and you were certain your usb drive and files on it are fine I have found it often to be hard drive or memory.

If memory is problematic I would expect the install to fail but you never know.

If you want to test memory use memtest below.

http://www.memtest.org/#downiso

 

[hondo]

I had a similar situation with my Daughters LT over last W/E

I did a Google on the problem & found MS have a fixit out for this problem, also I inserted the serial key to make sure the LT hadn't screwed up.

After two days of going

After the above everything was fine.