I have this problem too. Several people have had success changing the startup type to automatic - delayed start. How do you do this?
Dear carolmso
Type in 'services' in the search bar of the start button, double-click on the search result (should only be one).
Scroll down to the service 'windows live id sign-in assistant' and double-click on the service line.
In the resulting pop-up you can change the 'start-up type' of this service. Click OK etc. after changing and then close the services window. Try a restart (preferably cold boot) to test the changes.
I have mine set to 'manual' while I await a response from MS. All other options did not work for me
good luck