Acer aspire one zg5 netbook wont update windows

You can try updatinv windows manually by choosing the option which says let me choose the updates
try installing .net frame work serial wise like first install 2.0then 3.0 then 3.5 and at last 4.0 just write in google microsoft .net frame work and it will give you the dowload links...check your system for viruses as well with tools like hitman pro and malware bytes