I am running 10.4 software on a PowerBook 4. Lately weird things have been happening...applications keep randomly shutting down, everything running slowly, when I type there is a delay in the letters showing up, etc. I'm not running a virus software so I did a web search and found ClamAV (free). Installed it and scanned my User files. This has shown up. Trojan.Downloader.Istbar-176 FOUND I'm pretty ignorant on hardware issues. Should I purchase a virus package and run it? How do I get rid of the Trojan? Any advice?? Thanks for all you techies out there!