Since this is only happening on shutdown, I would not be too concerned.
What I would do is get the computer connected to the Internet and download all the latest patches from Microsoft. Just click on "Start" and choose "Windows Update".
After you have installed the patches, download the latest drivers for your sound card and other peripherals.
In the interim, just make sure that you run ScanDisk regularly to fix any problems that an incomplete shutdown may have caused, and back-up your files regularly since some files may become corrupted from the errors. TC.
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