Sounds like you have mic capability now, but that you need to select the right settings for your situation.
Im assuming that you are dealing with an external single "combo" audio jack on the side of your laptop.
Please note that the combo audio jack does not normally support a conventional microphone. Typically the standard combo audio jack involves use of 3.5mm 4-pole plug.
(Now we're gonna see more why audio is so complicated.)
Ordinarily, the OS that came as OEM with your Toshiba will come with customized application sound software for managing the audio configuration capabilities unique to your model.
For example, there should be an audio control panel that allows selecting internal mic (if any) or external mic input from the side jack.
Then if external side (4-pole combo) jack is selected, there will be options to select how the external jack is to be configured:
- As headset (that uses combined speaker and mic - hence 4-pole jack)
- As speaker output only or
- For mic standard input only
If you have upgraded to WIN10 from another OS version, then forget about the customized Toshiba sound panel application. You are now in the hands of Microsoft Windows10 and with whatever that can provide for your unique situation.
Some options for you are to :
- Investigate the sound control settings available in your current WIN10 installation to see if you are able to configure your external combo jack as mic for input only (using standard dual pole plug).
- Use an adapter plug (Note: sometimes people complain that these dont work for them either):
http://www.headset-ratings.com/pc-headset-to-phone-adapter-dual-3-5mm-to-3-5mm/
- Try a microphone that uses the correct jack for use with an external combo audio jack, as otherwise, if you get any audio input, it could be only one channel.
- By an external mic system:
https://www.bestproducts.com/tech/gadgets/g1422/external-sound-cards-for-pc-or-mac/
- Try getting rid of the Realtek driver and let Windows manage your sound and deal with it as best as it can:
Good Luck