k, translated your batch to script.
why use batch when you can simply do it with kix:
code:
if exist("c:\media9.txt") exit 0 endif

copy "\\mda_fs2\IT_support\software\wm9\media9.txt" "c:\"
shell "regedit /s m:\software\wm9\media9\MP9\media9.reg"

shell '%comspec% /c DIR C:\"Program Files"\"Windows Media Player"\"wmplayer.exe" >> \\mda_fs2\IT_support\software\wm9\'+@userid+'.TXT'
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