I have an Hp desktop running Windows 7 sp1 Home edition.. started auto update on the 13th, when i got home later that day it was stuck at 33 percent or so. left overnight 10 hrs. no progress. Shutdown and restarted not a great option but, unit would not do anything else.. Now it tries to install for an hour then does a roll back to previous. It will finish that after 1-2 hours. Then go into shut down.. will never shut down left it for 24 hours no result.. restarts and will be in the loop. Safe mode same results. If I can avoid rebuilding it would be great but.