I think you were specific enough...every suggestion so far should do exactly what youre wanting to do. Did you look at the UDF that Doc posted? In your case...you could use the UDF and do something like this...
Code:
$null = PathMod("c:\changeme2","c:\changeme3")
Function PathMod($CValue, $RValue)
Dim $Array, $aCntr, $KeyVal2, $fCntr, $stat, $KeyLoc, $Keynam
$aCntr = 0
$fCntr = 0
$stat = "FALSE"
$KeyLoc = "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment"
$keyNam = "Path"
If $CValue = "" OR $RValue = ""
Select
Case $CValue = ""
$Pathmod = 2
Case $RValue = ""
$Pathmod = 3
EndSelect
Return
EndIf
$KeyVal = ReadValue ($KeyLoc, $KeyNam)
$Array = Split($KeyVal,";",-1)
For Each $Element In $Array
If $Element = $CValue
$Array[$acntr] = $RValue
$stat = "TRUE"
EndIf
$acntr = $acntr + 1
Next
For Each $Element In $Array
If $fCntr = 0
$KeyVal2 = $element
$fcntr = 1
Else
$keyVal2 = $KeyVal2 +";"+ $Element
$fcntr = $fcntr + 1
EndIf
Next
If $Stat = "TRUE"
$RC = WriteValue($Keyloc,$KeyNam,$KeyVal2,"REG_SZ")
If $RC = 0
$PathMod = 0
Return
Else
$Pathmod = 1
Return
EndIf
EndIf
EndFunction
