It is not something to be unlocked. It consist of the Synaptics driver which enables you to scroll up/down or left/right with the touchpad. you can find it here: http://global-download.acer.com/GDFiles%5CDriver/TouchPad/TouchPad_Synaptics_12.1.3.1_Vistax64Vistax86XPx86_A.zip?acerid=633849709669441010&Step1=Notebook&Step2=Aspire&Step3=Aspire%205517&OS=V10&LC=en&SC=PA_7 In the case you had it already installed and still isn't working, go to Control Panel/Mouse, then go to Device Settings tab, then double click the Synaptics TouchPad on PS/2 port. Then on the Properties for Synaptics TouchPad window, go to Virtual Scrolling, and enable both checkboxes. DONE!
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It is not something to be unlocked. It consist of the Synaptics driver which enables you to scroll up/down or left/right with the touchpad. you can find it here: http://global-download.acer.com/GDFiles%5CDriver/TouchPad/TouchPad_Synaptics_12.1.3.1_Vistax64Vistax86XPx86_A.zip?acerid=633849709669441010&Step1=Notebook&Step2=Aspire&Step3=Aspire%205517&OS=V10&LC=en&SC=PA_7
In the case you had it already installed and still isn't working, go to Control Panel/Mouse, then go to Device Settings tab, then double click the Synaptics TouchPad on PS/2 port. Then on the Properties for Synaptics TouchPad window, go to Virtual Scrolling, and enable both checkboxes. DONE!
Press Fn key and F12 at the same time.......(note Scr lk is written below F12 key)