I'm on my parents' iMac 1Ghz G4 with 256MB RAM. Recently, when I'm running Acquisition and my downloads are >100Kbps, I cannot seem to access the 'net using Safari. It tells me that I'm not connected to the Internet, even though I KNOW I am, and/or that it can't find the server. When I quit Acquisition, everything is normal again. Also, for some reason the iMac has been running slowly lately. I've been downloading a lot of TV Shows to convert, etc. and put on my 5G iPod. I know that Mac OS X 10.4.4 (that's what this one's running, haven't updated yet) automatically defragments your HDD with files under 20MB, but lots of these files have been +20MB, around 100MB or so. I've been encoding, Lostifying, and copying these files into iTunes, then deleting all the copies I don't need, via Empty Trash (not secure). Should/Can I defragment this computer's HDD, and how?