Unless it's a typo, the reason it doesn't work is that you have the "Else" keyword commented out.

Code:

$SystemList = Split("ych-ctrx1|ych-ctrx2|ych-ctrx3","|")
If AScan ($SystemList, @WKSTA)>=0 
 ;Do nothing
Else 
 Use o: /Delete /Persistent 
 use o: "\\ychs2kmanage\officescan" 
 shell "o:\pccsrv\autopcc.exe"
EndIf
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Eric