Using MS Powershell to Query MS Access with Complex SQL Query

Hello,

I am trying to query an MS Access DB from a PowerShell script using a fairly routine SQL statement and am running into a strange error.  I am using the methodology outlined here:

http://www.microsoft.com/technet/scriptcenter/resources/qanda/jan08/hey0115.mspx

Which works fine for a standard SQL query.  But I want to use a WHERE statement in my query.  So line six would look like:

$objRecordset.Open("Select * From Computers WHERE operating_system = 'Windows XP'", $objConnection,$adOpenStatic,$adLockOptimistic)

But when I execute this line in PowerShell I get an error stating that the function call cannot accept five parameters.  Unfortunatly nothing I try helps me get around this issue.  I've tried -eq in place of the equals sign, placing the SQL in parentheses, etc and had no joy.

Does anyone know how to get around this issue?

Thank you!