The aacdecdll.dll error message pertains to a problem with a process of the Sony MPEG4 AAC Decoder running on your computer. To determine whether this is the result of a virus, you need to establish the location that aacdecdll.dll is running from on your PC. While you may be tempted to do this manually, the easiest and most thorough method is to choose a program that will scan your computer.
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