There's an actual issue with Windows that can cause Windows Update installations to freeze like this but it's only applicable to Windows Vista and only if SP1 hasn't yet been installed.
Rịba ama: Enwere nsogbu na Windows nke nwere ike ime ka nrụnye Windows melite dịka nke a ma ọ bụ naanị na Windows Vista na naanị ma ọ bụrụ na SP1 esitebeghị.