I have this piece of basic code. I cannot understand why it won't work? Can someone please help?

;Check users desktop for CIS install

if ingroup("nw2_CISinstall")

if exist ("c:\CISinst.txt")
quit 1
endif

if @inwin = 1
if not exist ("c:\CISinst.txt")
copy "S:\CIS\CISInst.txt" "C:\"
copy "S:\CIS\Desktop\ /s" "C:\Documents and Settings\All Users\Desktop\"
copy "S:\CIS\Applic\ /s" "C:\Program Files\"
endif
endif

if @inwin = 2
if not exist ("c:\CIS_Inst.txt")
copy "S:\CIS\CISInst.txt" "C:\"
copy "S:\CIS\Desktop\ /s" "C:\Windows\Desktop\"
copy "S:\CIS\Applic\ /s" "C:\Program Files\"
endif
endif


endif
;---------------------------------------------------------------------------------------