Help with dBpoweramp and Codec's...

[TheWILDheart]

OK so I am almost there with this converting thingy. I know how to do it now except...it won't convert. When I try to convert I get this error message:

Error converting to Wave, 'C:\Documents and Settings\Chris\My Documents\Azureus Downloads\STEVIE_NICKS_10_20_89_MOUNTAIN_VIEW_CA\Oct.20,1989-Mountain View, CA-Shoreline Amphitheatre-Upgraded! Disc 1\1Stevie Nicks - 1.Outside the Rain.shn' to 'C:\Documents and Settings\Chris\My Documents\Azureus Downloads\STEVIE_NICKS_10_20_89_MOUNTAIN_VIEW_CA\Oct.20,1989-Mountain View, CA-Shoreline Amphitheatre-Upgraded! Disc 1\1Stevie Nicks - 1.Outside the Rain.wav'
Error: Unable to load decoder for file type '.shn', codec not installed? visit 'Codec Central'. [dBCoreConverter::dBCoreConverter]

Any idea's about how to rectify this?

Thanks to everyone who has helped with this so far.

All the best,
Chris