[media_plugin_cef]

I have been looking for it but I have yet to find a solution, so maybe you can lead me to where I need to look?

[media_plugin_cef]

Yesterday, I did a reboot of my computer to make sure it was fresh for me to stay logged in during the night without crashing. However, I have not been able to be on Second Life properly again. First of all, I get the media_plugin_cef failed to load error. When I proceed to go and log in, eventually I will be logged in but that's about all. The viewer will freeze up for 20-30 secs, work for about half a second and back to freezing. Everything in-world takes forever to load and I cannot do anything in there.

Now, what have I done myself:
I have reinstalled the viewer.
I have done a clean install of the viewer.
I have removed the appdata folders for all the viewers I have used.
I tried third party viewers and the SL viewer.
I have been installing older versions of viewers.

What is interesting in all this, and I do think here is the problem but I am not very technical, is that when I uninstall a viewer (clean install) and then install it again, it will tell me that the viewer is already installed and if I would like to install it again. I have no clue how to fix this anymore and I have tried everything I know myself or could find on fora. Please help me out in this situation.