In most cases, the etdctrl.exe is an ETD Control Center application from ELAN Microelectronics Corp. - thsi applications is a touchpad solutions for notebooks, it enables the user the possibility to use multi-finger moves on the touch pad in a very similar way as in the smartphones screen, check more info on the project pages on http://www.emc.com.tw/eng/ap02\_01\_04\_01\_tps.asp - See more at: http://systemexplorer.net/file-database/file/etdctrl-exe#sthash.DFpITxnF.dpuf
ie. you need this running if you want to use fancy gestures on your lappy touchpad.