Windows 8 Apps does not list all the softwares installed on the system.

[Carox]

Hello,
I have a sony vaio laptop which came with a pre-installed windows 8 OS. I recently upgraded it to windows 8.1. After the upgrade, I have observed that many softwares that are actually installed on the system are not listed in the apps list, such as Microsoft office, autocad, freemake, etc.
Can anyone help me fix this issue?
Thank You