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You didn’t mention when this is happening or what version of , but I’ve had it occur while using Chrome browser. I have simply shut down Chrome and restarted it, and had haven’t had any further problems beyond having it pop up one other time. Apparently Windows Media Player can also cause this to happen. One suggestion I’ve seen is to uninstall and reinstall Windows Media Player, but I haven’t tried this. Another suggestion was to install Temporary File Cleaner, which is also in haven’t personally tried it category.