Did you try this already?
1. Click Start, and then type cmd in the Start Search box.
2. In the search results list, right-click Command Prompt, and then click Run as Administrator.
3. When you are prompted by User Account Control, click Continue.
4. At the command prompt, type "fsutil resource setautoreset true C:\ " without the quotation marks & press ENTER.
5. Reboot your machine and try to update again