What version of Windows do you have? (sorry for my bad engish! )
Hardware info? RAM, CPU, Video card...

Bandicam version?

In video tab, select "Settings" (near "Presets" button) and set "Quality" to 100.

I tried to overlay FPS over Skype call window, but the only thing that didn't work was when I tried to overlay the FPS in the bottom of the window. Did you try to maximize the window?

I think that Bandicam serials work on every version of bandicam... You can try to register the japanese version with your detail, else you have to wait for a bandicam reply (that you can contact by mail).

...I know that some program's serials are associated with the Motherboard/CPU so i need to know this before i buy Bandicam. ...

No, bandicam serials are not associated with any hardware components of your PC.

I don't know, but you can try to record a little video with your resolution (1-2 minutes is enough) and upload to YouTube.

Go to "Video" tab -> under format click "Settings" -> [New window] in "Size" set "Customized" -> set your resolution (for example 1680x1050).

Did you alredy try to record Skype chat with default options (Windows 7 WASAPI) and your mic? I can't help you more because I don't own a headset, but try with "Windows 7 WASAPI (or what else you use to record game)" and your mic.

You can try "VLC media player" or try to play it with QuickTime; otherwise you can convert it with a file converter like FormatFactory.

What game(s) did you try?