What do you mean with that?
By default openSUSE does not install updates automatically. It just shows you that there are updates available.
You have to initiate the installation manually, but the updater can be configured to that automatically as well.
Just install the guest and no other installations required?
Correct, openSUSE installs the guest additions automatically.
There is so much misleading info that says to download guest additions. Even in the Linux online manual it says to do apt-get, guest additions, and many other things. Where does this information appear, so that in future I don’t go on a wild goose chase again.
Well, if it mentions apt-get, it’s most likely intended for Debian or Ubuntu… 
Are you also saying that after I reinstall the guest, that I should re-install these same packages that have caused this problem? I am not sure I am understanding? :\
If you re-install openSUSE those guest packages should get installed automatically, so no further action necessary.
Would it be sufficient to just do a command “suse virtualbox-guest-kmp-desktop” and not install those other packages that seem to be corrupted.
First check with “uname -a” which kernel you are using. If not kernel-desktop, you have to replace the “desktop” in the following command appropriately.
You can re-install the included guest additions with:
sudo zypper in -f virtualbox-guest-kmp-desktop virtualbox-guest-x11 virtualbox-guest-tools
But you should uninstall the files created by VBoxLinuxAdditions.run first:
sudo sh ./VBoxLinuxAdditions.run uninstall
And no, you don’t have to install VBoxLinuxAdditions.run on an openSUSE guest, the guest additions are already included.
If it still doesn’t start afterwards, you should remove the file /etc/X11/xorg.conf if present. (maybe
VBoxLinuxAdditions.run creates this?)
You can of course install the guest additions using “VBoxLinuxAdditions.run” like explained in the manual (there is a section especially for openSUSE), but it’s not necessary. And you should remove the openSUSE packages first in that case.