Can one cause damage if registering a windows dll file if it is already registered?

Vista Home Premium 32 bit with Vista SP 2

 

I'm not sure if the file jscript.dll is currently registered in my system.

 

The microsoft directions are to

Go to Command Prompt

Open as administrator

type in     regsvr32 jscript

then enter

 

But here is my concern. If it is already registered, will enacting this process cause problems if one registers it again?