I have used Spyware Blaster for the longest time on my desktop, but I had 3.5.1. My firefox is 220.127.116.11. I had no problems on this said computer which is a desktop. Well I have a laptop I wanted to put spyware blaster on, and so I downloaded the latest version, 4.0. Well it tells me firefox is not installed. Same version as desktop. I tried uninstalling and reinstalling firefox, didn't work. I tried uninstalling and reinstalling spyware blaster 3.5.1. Still nothing. I looked for that file registry.dat in firefox file and there wasn't one. I even did a search. Can anyone help? I love Spyware blaster on my other comp, it does a wonderful job, and its needed on this laptop. Thanks!!