The touchpad showing up in Device Manager as a PS2 device is normal. Sometimes it will show up as an Elan or Synaptic if it is using that particular driver but Microsoft uses its own native touchpad driver so there should not be a problem for it to show up as such in Device Manager. If it is jumpy and laggy there may be a hardware problem with the touchpad itself. For assistance with this though please contact Acer support from the contact info posted here:
