Though not supposed to really be a problem today, it could very well be somethings that's cropping up once again.
Years ago, the symptoms you describe was the results of a simplex audio card.
To playback and record at the same time required a duplex card. Which would cost more money.
Today this shouldn't be an issue, but considering how cheap computer have become it's possible that it's once again finding it's way back into the machines to keep costs down.
You should check on your soundcards specifications to determine if it is indeed a duplex card.
Since you say this is an "old" laptop. Define what "old" means to you. If you are saying "old" as I consider "old", meaning a 133Mhz CPU powered laptop. It's likely then you only have the capabilities of a simplex card. Which means, you can only do 1 thing at a time. Either record OR playback, but not both.
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