[Image-SIG] IOError "decoder jpeg not available" on Win7

[David]

I am running Python 2.6 on a new Win7 machine.  Installed PIL from the 
PIL-1.1.7.win32-py2.6.exe binary.  I am trying to resize a jpg.  I get 
the IOError message "decoder jpeg not available" when I call the save() 
method:

im = Image.open(infile)
im = im.resize(newsize,Image.ANTIALIAS)
im.save(outfile, "JPEG", quality=90)

I have scanned a year of back messages on this list without seeing any 
relevant advice.  I have used PIL with the same code on other Win32 
machines without problems.

Help or advice would be appreciated.

David Flory