Can't get ECW format recognised

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mai
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Can't get ECW format recognised

mai
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Hi
I've been reading lots of posts but still can't get ecw aerial layer support working.
Using the gdalinfo --format ecw command, gdal says it doesn't support it.

I have installed the erdas ECW sdk 4.1.

I have folders called:
C:\OSGeo4W   (v 1.7.3)
C:\ms4w

Where do I put the ecw dlls:
NCScnet4.dll
NCSEcw4_RO.dll
NCSUtil4.dll
tbb.dll

Inside:
C:\ms4w\gdalplugins?
C:\ms4w\Apache\bin?
C:\ms4w\Apache\cgi-bin?
C:\OSGeo4W\bin?
Somewhere in the system folder
WHERE??

I have tried most of those places without success.
I can't find any clear instructions anywhere, everything I have is pre-compiled.

Any help would be appreciated.