Hi Yeow,
There are a couple of potential issues, so things to test.
- turn off any firewall/anitvirus on the PC and see if the remotes appear
but more likely, it is the Realtek Drivers causing an issue
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Make sure your realtek drivers are up to date by getting them from the video manufacturer not via Windows update. I would uninstall completely and then re-install the drivers.
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On machines which do not need those drivers for other things like games, I actually use the MS HD Audio drivers instead.
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Look and see if you have a nahimic service/driver running. Disable it, reboot, and see if the audio devices appear.