Hello everyone having problems with norton internet security 2005 installs. I to was having problems to numerous to mention. I was about to give up on it but thought maybe the registry had something to do with it so I ran regedit and searched for anything to do with "SYMANTEC" and also "NORTON" everything I found with those terms in them I deleted. After I did that I and rebooted I was able to Install Internet security 2005. Hope this helps. Oh make a back up before messing with the registry.