The SM Bus controller is the chipset driver that is available from the official acer download site. You have to run the installation software to install the driver. (Your computer will not automatically detect this driver) The USB controller is also available from the official acer download site.
http://www.acer.com.au/ac/en/AU/content/drivers If you load it into a folder onto your hard drive and update driver in the device settings (control panel>system>hardware>device manager and choose "install from list or specific location" and then select the folder where you placed the driver file. It will automatically detect the driver file from your folder. All the required drivers for your Acer computer are available from this site. From memory there are two other drivers that requires installation and is not automatically detected. When the drivers are extracted from the zip file you will see the ones that come with installation software.