I record some information to some slides but the presentation doesn't start from the 1st one but from the one I started the recording. What should I do?

I record some information to some slides but the presentation doesn't start from the 1st one but from the one I started the recording. What should I do?
Also, can I use music as backround to some of the slides, not to all of them as I'd like to play videos on the others?

I have reinstalled the drivers. I watched it install the realtec and cirrus drivers. Hovering the mouse over the speaker icon says 'speakers: HP'. They are actually 'Creative'. 'Properties' indicates 'IDT High Definition CODEC' and 'This device is working correctly'.
Driver details gives 'c:\Windows\system32\drivers\dmk.sys'.
There is still no sound, although the little level meter on the control shows a green bar rising and falling.
Obviously, it thinks it's working, but there's no connection to the speakers. They're not muted, either. I checked that too.
Any other ideas?
Thanks.

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