You can install Microstudio on 3 different computers. So I was confused when you said you had it on one, then you got another and it won't install.
So I checked your record, and found it has been installed on 3 computers. Well, the reason we allow 3, even though the license is for only 1, is so you can install on another computer when you need to upgrade.
You purchased a Karaoke Suite 2 in 2002 (Microstudio is basically free in the Suites), then bought a $15 Microstudio upgrade in 2003, now you need to buy another $15 upgrade in August 2004 to install on a forth computer. You can do this at our store.
Post back in this thread after you purchase and we'll enable installation on the 4th computer.