I was using Windows 7 when the popup asked me about upgrading to Windows 10. Everything went smoothly, yeah except my network controller was not detected by new windows. However I did not aware of it since I was using my wifi card due to some reasons.

Based on the answer by Google, there are 2 possibilities that I can do:

1. Uninstalling all anti-virus software, which I did with no luck.
2. Reset Windows 10, but keep the files. This method removed all my applications, but still no luck.

Guest what? I ended up buying a new NIC today and I am trouble-free now 😉