The ASUS ATKOSD2 Utility, for Windows Vista, changes the images you see when you use the function key shortcuts and other hotkeys. The images have a small 3D effect such as water ripples.
ATK0100 is a ACPI utility which has do to with the motherboard and power management.
The file ATKOSD2.exe is located in a subfolder of "C:\Program Files". ATKOSD2.exe is able to record inputs. Some malware camouflages itself as ATKOSD2.exe, particularly when located in the c:\windows or c:\windows\system32 folder.
According to one review site, 7 users said ATKOSD2.exe is essential for Windows or an installed application, 7 users said it's probably harmless, 2 users said it's neither essential nor dangerous, and 1 user said that ATKOSD2.exe is dangerous and should be removed.