Question: How is your headset connected? Via Bluetooth? Via jack?
If I were you, I would try the following things:
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Restarting your computer;
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Going to Windows Sound Settings, right-clicking in an empty part of the Playback tab, and checking if FxSound is still there, by looking for disabled or hidden devices;
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Going to both Control Panel > Programs as well as Device Manager, and checking if FxSound is still present there;
As well as [EDIT] the following points from my standard troubleshooting list:
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Try completely removing, and then re-adding the problematic sound device(s) ( = your headset);
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In Windows Sound Settings, disable all the devices you don’t need, including the hidden ones;
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If you are experiencing choppy audio and if this issue is CPU-related, then downloading LatencyMon and running a scan […] could help you identify the issue;
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Since the FxSound driver can be removed with relative impunity, you could try performing a manual driver uninstall;
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If your problem is indeed a result of installing FxSound, then you could try getting rid of every last trace of it with specialized full uninstaller software.
Let me know if any of this helps.
If not, I will call in some further assistance.