Well, if the ini file is always structured the same, there's really no need to go looking for the line.

Going back to my original solution...

 Code:
for each $Element in $PClist
    $array = ReadFile("fsp.ini")
    $array[2] = "pcAlias="+$Element
    $ = WriteFile("\\"+$Element+"\C$\fsp.ini",$array)
next