Hello teeyo;
Your Acer Aspire 4745G is a laptop computer with a Core i5-430M CPU and a HD 5470 video card, correct?
ATI Catalyst Control Center for Win7 64bit
http://download.cnet.com/ATI-Catalyst-Display-Driver-Windows-Vista-64-bit-Windows-7-64-bit/3000-2108_4-10607879.html