How to re-enable windows .chm viewer

Sometimes it may be disable to view windows help. an error message may appear like ...

mk:@MSITStore:C:\WiNDOWS\Help\netcfg.chm::/how_to_enable_component.html


then what do u do ??
Just run this following command in Start>>Run>>

regsvr32 itss

and press enter. you are done