How to Record Microphone Audio While Recording Video (Windows XP)
For Windows XP, operation may not be normal because Microsoft has ended support for this operating system. (Reference)
In the Windows Control Panel, click Sounds and Audio Devices.
The Sounds and Audio Devices Properties window will appear. Click the Advanced button.
The Volume Control window will appear. Click Options - Properties from the menu.
When the Properties window appears, select the Recording radio button, check the Microphone Volume checkbox, and then click OK.
A new window will appear as shown below. Check the Select checkbox under Microphone Volume.
After closing the window, go back to Control Panel - Sounds and Audio Devices - Advanced, then click Options from the menu.
Then, this time, click the Playback radio button, check the Microphone Volume checkbox, and click OK.
Under Microphone Volume, clear the Mute checkbox.
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How to Fix the Black Screen Issue After Recording in Windows XP
For Windows XP, normal operation may not be guaranteed because Microsoft has ended support for this operating system. (Reference)
This issue occurs because the program you are trying to record is using the overlay mixer.
The easiest way to solve the problem is as follows.
Right-click on the desktop and click Properties.
The Display Properties window will appear. Click the Settings tab.
Click the Advanced button.
Click the Troubleshoot tab.
As shown below, Hardware acceleration is set to Full. Change it to None.
After setting it as shown below, click OK, close the program you want to record, and then try recording again.