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Don't be silly, keeperxiii. Windows often has multiple rundll32's running.
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From win xp onwards I haven't seen Windows using this.
And rundll32.dll is very commonly used by viruses. The generic name "rundll32.dll" might tip you off that this could be anything being used by any program

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It's like this:
Rundll32.dll is a generic name for a .dll running in the background, thus, it's very commonly used by viruses. It's quite simple actually.