After rollback the setup give me this error => Error 0xC1900101 – 0x40017 ; windows update is not the problem same using iso.
It is a know problem that appeared also when updating 8.0 ==>8.1 check that post :
http://answers.microsoft.com/en-us/w...7-b9065099efd6
Actually retrying , i updated bios, removed nvidia cards, uninstalled eveything security related and nvidia drivers, unpluged Logitech wireless receiver, disabled network and sound in bios and also removed the latest RAM modules leaving only one.
Will update in a few hours (1go RAM and old disk)
EDIT: Update worked, reactivated everything put ram back ect... memory corruption issues it seems just disable as much as i did and it should be ok