Gateway GT5408 PC Desktop "gmail froze" Questions

...froze yesterday. And now is powering up but Windows will not start. All I am getting is dark screen and mouse pointer. i could solve this via a remote support session, it sounds like malware to me, i ...

...FROZE UP. IT WENT TO DOS MODE AND SHOWED !!0xc01a001d!! registrymachinecomponentsderivedData...) now i tried to run windows diagnostic in all available ways, but it keeps saying no errors found, but ...