I am quite impressed with your product. However, I downloaded, paid for, and registered the product only to find that a Blaster-like virus popped up on my computer at the same time. I usually use my system without an Internet connection, so this is quite suspicious. I only added an executable (Stata) as a service, and when the Stata service started, so would the worm. I never had this problem before with Stata. Please check that your downloadable product has not been compromised.