Rundll32.exe

What is rundll32.exe. I have this in processes

 

http://www.neuber.com/taskmanager/process/rundll32.exe.html

What is rundll32.exe? Is rundll32.exe spyware or a virus?
Process name: Run a DLL as an App
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Product: Windows
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Company: Microsoft
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File: rundll32.exe
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Security Rating: http://www.neuber.com/img/spyrate1.gif


Note: The rundll32.exe file is located in the C:\Windows\System32 folder. In other cases, rundll32.exe is a virus, spyware, trojan or worm! Check this with Security Task Manager. Virus with same name:
W32.Miroot.Worm - Symantec Corporation
Backdoor.Lastdoor - Symantec Corporation
Trojan.StartPage - Symantec Corporation