I'm a real newbie to macs so bear with me. Purchased a new iMac 17" a few weeks ago and decided last night to run SafeShred (a file shredder utility) on my hard drive - thought I might clean it up a little. So, after a fairly short while, my iMac seemed to freeze - I couldn't get past the screensaver - though I could hear SafeShred running in the background. I decided to let it go through the night and this morning it was still frozen and the only thing I could do was disconnect the power supply. So, when I rebooted, my hard drive says that I have less than 1Gb free - over 79Gb used! My preference files seem to be shot to hell, I can hardly do anything on it. Every program I run seems screwed. Needless to say, SafeShred is not that safe. Does anyone have any ideas on what I should do next? Many thanks for any input.