Just a quick note, if you're using MSXML (Microsoft XML Core Services), make sure you test and retest your installation routines. If your customers have upgraded to Microsoft Windows XP Service Pack 3, you may run into issues. As of SP3, Microsoft has placed MSXML under system protection so that applications/installations that try to update/remove MSXML fail. The most common occurrence of this has been with Microsoft SQL Server, and Microsoft has posted a work-around on their website. However, last thing you want to be doing is fielding support calls, emails, and tickets because of this issue. We just caught this testing another company's product and thought we'd pass it along. Hopefully, Microsoft will help developers in handling this issue.