Hi guys.
I have installed NET+OS v7.5 in my Win7 64 bit PC…
But while building some of the sample projects itself I have encountered one same error…
You should open your ESP in “Win XP SP2 Compatibility mode” & run as “administrator”
Then go to
C:\cygwin420\bin -> go to properties -> make.exe
Do the same
Then build your files in ESP it will work fine… 
the screeshots are attached …
rEgArds
bOb tHOmAs