Still having Eclipse problems

My problems with Eclipse Luna continue. Going on holiday for a week I assumed the good fairies would sort it out, but no,,, Anyhow, I'm sure it's some path error somewhere, because if I open a command window in the project\armgcc folder and type "make", everything builds fine, but when I try to build the project under Eclipse I get this error:

process_begin: CreateProcess(C:\Windows\make4428-1.bat, C:\Windows\make4428-1.bat, ...) failed.
make[1]: Leaving directory `C:/nRF51822/nRF51_SDK_9.0.0_2e23562/examples/ble_peripheral/ble_app_hrs/pca10028/s110_with_dfu/armgcc'
make (e=267): The directory name is invalid.

make[1]: *** [_build] Error 267
make: *** [all] Error 2

and I can't work out what directory name is being referred to.

I sure an Eclipse expert could find this quickly, or even a make expert who knew how to find the invalid path, but I'm totally stuck!"