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 There are two places you can put the gradients that I know of in Windows:

c:\Program Files\GIMP-2.0\share\gimp\2.0\gradients

and

c:\Documents and Settings\(Your Computer Account Name)\.gimp-2.4\gradients

c:\Documents and Settings\(Your Computer Account Name)\.gimp-2.2\gradients

 I recommend the 2nd one i listed. It's the one I use. 

All wiyht. Rho sritched mg kegtops awound?