[GRASS-windows] problems installing WinGRASS

[ines_cherif]

Hi all,
I tried to install WinGrass following the instructions in GRASS wiki. 
I get no error message on the cmd.exe but an Error in startup script window appears:
Can’t read “env(GISBASE)”: no such variable while executing
“source $env(GISBASE)/etc/gtcltk/gmsg.tcl”
(file “c:\grass\grass-6.3.cvs\etc\gis_set.tcl”line 29)
Do you have any clue how the problem could be fixed?
Thanks.
Nesch