Please help, I am trying to troubleshoot my brother's computer. He is running 64 bit Windows 7 Ultimate and is completely unable to install any programs on it at all. Regardless of where he gets the program from, be it downloaded or from a disc, a popup always comes up saying the publisher of the file is unknown and it refuses to run the program, even run as admin. Windows Update constantly has errors completing any updates at all, and I suspect the problems are linked. This is with a fresh install of Win 7, and I'm told the problem first started with Vista Ultimate 64 bit.