I use CCleaner on my Acer model 5610, Windows Vista 32 home premier SP1, Intel Core2Quad CPU Q6600, @2.4GHz, 3 gig RAM, Radeon HD 2600Pro.
After downloading and installing CCleaner v.2.15.815 CCleaner started acting weird. I'd open the program, click on <continue> from MS Defender, and CCleaner opens fine. I run analysis and click on <run cleaner> and here is the problem. It starts cleaning and after it is done just closes itself and disappears. I watch the blue bar window and it goes to end, like it's done and closes. I guess as soon as it's done cleaning it disappears. It does not happen with the registry cleaner. It finishes doing it's thing and stays open. Thought you should know.
redbiker