Install Updates Graphical Glitch

[Şerban S.]

Humm, Jerry's right.
If you change de DE to something other than XFCE, only that could cause your problem.

Hi!
It was a great idea to put the screen captures!
From what I see, your trouble, is called "video buffer underrun".
You probably installed Unity instead of XFCE. While Lite is way above the average tolerance limits (I know it from practice!), using either Unity or Gnome 3, it's the same thing. You probably enabled all the graphic effects and this puts a high amount of pressure both on the CPU AND GPU.
On this kind of machine, this is the result you get.
Although Lite + XFCE IS speciffically designed for low resources computers, what you are asking, requires a Quad-core CPU and a far more advanced GPU, and lots of RAM. Anyway, more than 3 GB.
Now, if you really want to use Gnome 3 or Unity, best approach is to disable from the WM, all the video effects, since all they do is eat up 50% of your resources and nothing else useful.
Since my best guess is you want to do other things with this computer than play animations and the like, disabling the video gadgets, will get you closer to a usable system, even on this configuration.