I am using a Windows 7 64-bit laptop. I have been facing this problem for quite some time now, but did not bother to solve it. When I click on some of my programs and stuff, they do not start up, but instead the black command box pops up briefly and disappears, and nothing else happens. This has occurred on several programs only, though I forgot most of them, one of them is CCleaner.exe . I managed to solve that by troubleshooting compatibility, and running it on Windows' recommended settings. Alot more of the other programs which failed to start up before, e.g. Windows Live Messenger, started up after I troubleshooted compatibility. However, recently I decided to defragment my hard drive (after a long time of not doing so), and after I clicked on the "Analyze Disk" button, or the "Defragment disk" option, the black box appears briefly, and disappears, and nothing happens again. Any help to solve this?