I Have given up with XP, it will not work properly with the ACER 7535G I have installed Windows 7 and everything is good. It now runs a lot of recent games on high settings. One problem that you will come accross is that the HD 4750 card wont be selectable in the display options unless you do the mobility modder from driver heaven.http://www.driverheaven.net/modtool.php
Then you can see it in duel view, but you can then chose to just use the second card only.
Hope this is helpful to someone