ATI HydraVision - HYDRADM.EXE
HYDRADM.EXE installs with ATI's Hydravision, a multi-monitor Management program that enables you to tailor your desktop to the way you work, so you can manage increased amounts of information and improve your productivity. Hydravision increases your desktop work space by using up to two monitors and creates multiple layers of desktop workspace with Multi-Desk. HYDARDM.EXE is part of the Multi-Desk manager.
If you don't use these features, you don't need this file. More information and a handy FAQ can be found at http://www.ati.com/kr/products/hydravision/faq.html.
A fix for the "ATI's Desktop Manager is being unloaded" on system startup can be found at http://www.ati.com/support/infobase/3999.html.
Finally, you can update your ATI drivers and get support at http://mirror.ati.com/support/driver.html.
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ATI Technologies