Since the NEWID() is a SQL function and not a VB function you'll have to use it as part of your SQL statement.
NewID() can be used with an INSERT statement to generate an id for the uniqueidentifier data type column in your table:
strSQL = "INSERT INTO table(column, guid) " & _
"SELECT 'columndata', NEWID()"
Mark
"You guys pair up in groups of three, then line up in a circle."
- Bill Peterson, a Florida State football coach