I also have this problem. My machine is a Toshiba Portege A605-P200. I just last night upgraded from Vista and applied all pending win7 updates, so perhaps the problem is related to online upgrades? For the last 4 hours, it has been working on Wiping the MFT Free Space, and for the last hour or so has been showing 2 hours, 8 minutes remaining. Completion percent has grown slowly, even if the estimated ETA has not changed - I just noticed in the past 5 minutes that it bumped up from 36% complete to 41% complete. I'll check to see if I can reproduce with a clean install, which I'm not sure if I can do, but here's hoping...