k, lets start with changing your code to kixtart.
there is no use using it if you keep shelling out each line.
Code:

If InGroup("EVERYONE")
Shell "NET USE S: \\KC-dc01\SWAPS$"
Shell "NET USE G: \\FS1\ENG\SCANS$"
EndIf


should be like:
Code:

If InGroup("EVERYONE")
USE S: "\\KC-dc01\SWAPS$"
USE G: "\\FS1\ENG\SCANS$"
EndIf


then, specially as you don't know what is going on, error checking must be applied!!!!
Code:

If InGroup("EVERYONE")
 USE S: "\\KC-dc01\SWAPS$"
 if @error
  ? "Couldn't map drive S:"
  ? "ERROR: " @error " " @serror
  sleep 5
 endif
 USE G: "\\FS1\ENG\SCANS$"
 if @error
  ? "Couldn't map drive S:"
  ? "ERROR: " @error " " @serror
  sleep 5
 endif
EndIf
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