I was playing a game of Chess Titans, and while playing it, I opened up an IE window to access the internet. I couldn't connect to the internet - I had been able to connect a few minutes earlier, but the usb wireless adapter I'm using is a little flaky. Then I couldn't close the browser at all, and CTRL-ALT-DEL didn't do anything. Vista just froze, it wasn't a BSOD, it just froze. I waited several minutes, while trying CTRL-ALT-DEL, ALT-TAB, CTRL-ESC, unplugging and reconnecting the usb wireless adapter and the usb keyboard. Vista never responded. I had to hold down the power button on the computer for several seconds to turn it off. Then I turned it back on, and I ran a "chkdsk", and it said "Windows has checked the file system and found no problems." But when I try to run Chess Titans, nothing happens. Absolutely nothing happens - no errors, and chess.exe does not appear in the Task Manager at all. What's going on here?