I have an Acer Aspire Z5610 all-in-one desktop. Windows 7 Ultimate 64bit.
I was getting a blue screen, generally when multitasking and streaming video going. A friend suggested a video card driver
upgrade, which did in fact resolve that problem. A few months down the road, the computer would just suddenly shut down. No blue screen. Found and installed an updated driver (8.920.0.0 date 11/9/2011), but didn't resolve problem.
The only thing that seems to prevent the shut downs is to change the "theme" to "Windows 7 Basic", without any HD wallpapers. Additionally, moving windows around is not smooth and remnants of closed windows stay on the screen occasionally.
Found some threads here that mentioned a conflict between Intel chips default video driver and the ATI driver, but only the ATI card shows up in the device manager.
I just assume it's the video card or driver because changes in how the graphics are displayed seem to effect the shutting down. Some have suggested it's the RAM or mother board.
I am not an advanced user, so any suggestions you can offer will be greatly appreciated.