I have been using CCleaner quite successfully for the last year and on all four of my computers (without a glitch I might add). Today however, something very odd happened. I was running a scan for issues on CCleaner and I left the page to respond to am email message. When I came back the entire CCleaner page was blank and I tried several methods to close CCleaner, none of which worked but all of which produced the Windows Error Reporting dialog box as if I had indeed shut down the CCleaner app. I went to Task Manager and tried to close it in there and for the first time ever was not able to terminate a stubborn program (CCleaner.exe) that was running. I decided to log off as I was getting nowhere. Well, you can guess what happened then- my computer froze at the Windows Shutting Down screen and I had to force the issue by just shutting off the computer. So far, since I restarted I see no collateral damage, and Event Viewer only shows the errors as a CCleaner.exe App Hang. Everything else looks fine, but I am concerned that I couldn't terminate the running program in Task Manager. Any thoughts?