Freddy - Terry's suggestion is the way to go - I was doing a brain fade. The fact that you're getting a parameter error is more likely due to the bracketed item not being found. If you didn't have the round function, the error message you would receive would probably state something like "undefined function".
Just for general knowledge though (and lol, to help make up for my faux pas!!) - if you change the COL1 to match your field name and no longer get an error message, then the round function has been added to your database. It could be in a couple different places - but if you go to a code window and do an Edit, Find you could search for the word "Round" in the entire database. It would bring up whatever module it's stored in. (In the alternative, it's possible that Access 2000 includes Round as a built in function, but I don't think so. I don't have Access 2000 right at hand to check it.)