Often when these 'manager' or control panel' windows display, they do so for a reason. Is there a message in this window? If so, what does it say?
Does your sound work well anyway? If not, perhaps the window is telling you about a fault.
Mark
I am using Windows XP have a problem with Realtek HD Audio Manager that came with Windows keeps popping up in screen, driving be crazy, just keeps doing when I first open up, when I am on emails, different websites.Stops then later starts again. Tried closing down and plugging in different connectionenction but still does it.This seems to have happened snce we moved and had to reset up, I am a senior with limited computer knowledge so please not too technical jargon
Thank you

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