And if the op does not have a license (or close to expire) he can un-install it and use Avast or Avira.
The program files look to be all legitamate programs. I do not know what they all are, but they look ok.
They might also be programs the op has installed and uses.
We can't do anything for the "common" files. They need to stay.
The SGM files are explained HERE. The a 0 bytes and not taking up space.
I do not know what else we can do other than recommend a backup drive/slave to put data on, or a larger hard drive.