In Win8.1 64-bit, Unable to install software, unable to restore, unable to open event viewer. Windows update won't show installed updates nor will it find new ones to install.
In short, it appears that .NET framework was broken, the Visual C++ 2005 group of files were also uninstalled from the add/remove program. The best error message I have is:
An error occurred during the installation of assembly 'Microsoft.VC80.CRT.type="win32",version=8.0.50727.6195".publicKeyToken=
"1fc8b3b9a1e18e3b".processorArchitecture="amd64". Please refer to help and support for more information HRESULT: 0x800700C1.
(This particular error was created by trying to install a freshly downloaded copy of iTunes, but it has also appeared with different variations when I try to install many programs.)
Hitman and McAfee show no virus. Very lightly used, newish all in one HP PC, so I do not suspect virus. I think it's the software. Where do I go next?