Audio distortion with Windows 7

Running Windows 7 Professional 64-bit, Service Pack 1 on a Dell XPS PC 8700 Special Edition.  I have the audio distortion / rupture & dropouts/skips during playback of music from the computer via headphones or external speakers.  The problem occurs if the source is iTunes, Windows Media or optical drives.  Listening longer, more frequent & become serious mistakes.  When to listen torn copies of the same music through an iPod directly connected to the stereo or headphones, no errors occur.  I installed an ASUS Xonar U7 external sound card.  This seems to have improved the overall sound, but it has not solved the problem of distortion.  The drivers concerned appear to be up-to-date.  Any suggestions?  Thank you.

Please run a check of system files (SFC) & DISM if you're on win 8 or higher 

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Tags: Windows

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