Just a guess but I would say you had a communications driver missing as well as an audio driver and that the Windows Update fixed the communications driver so that at that point the computer could see your sound card; then when you ran the Realtek driver install that fixed the Audio driver as well.
Other less happy possibility is that there is some hardware issue such as your audio cards connection is loose and it will work sometimes but go out others.
Let's hope it was the first thing and that now you are all fixed.
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