YES !!!! Really thank to everybody you helped me found what was wrong !!! First of all I wrote "doamin" in my script instead of "domain" ! Then this part of the script :
If ComputerInGroup ("PC-CENT-SI")=1 ? 'UDF ComputerInGroup works...'else ? 'UDF ComputerNOT InGroup...'Endif 'Error #'+@Error+' ['+@SError+']'
helped me a lot to found what was wrong !
Now it works well I'm going to add my printers I'll confirm you that all work fine !!
Again thanks to all !!