[Can't install the latest release]

I do, and there are six or so other files that give me the same message, including the files needed to voice. 

[Can't install the latest release]

So, yesterday, my voice decided to vanish. After an annoying few hours trying everything I could think of, I decided to do a clean install.

 

What a mistake.

 

I uninstalled the viewer, and downloaded the latest .exe from the Second Life website. I opened it, and hit Install. I waited. When the install was almost done, I started getting these:

For some reason, I cannot install the latest viewer at all. And there are many files that are broken like this, including (shock and surprise) the vox files that I need for VOICE, the thing that was broken in the first place.

Can anyone offer insight into what the... ahem. Into what's going on? I'm getting terribly frustrated.

Thanks, all.