Ok i have just got off a web chat with ACER.
I thought it best to post my results so others who have this issue can find a way to at least roll back.
ACER has inbuilt software, i was told to go Start, All programs, Acer, Acer eRecovery Management, select restore, select reinstall drivers or applications. then select the AMD VGA option, after install and reboot i am back to the driver i had this morning.
However i am still left with the issue that when i really really need to update my graphics driver i will be unable to as since i got this PC i cannot update by just installing the new driver over the existing one, but if i try to uninstall the current driver, reboot, then install the new driver the above issue happens.
Can anymore shed any light on how to get the 13.1 driver update without having to uninstall the current driver?
Please also note that if i try to install the update over the current driver version i do not get any errors etc, all that happens is it says its installed but when i reboot and go onto the driver date it is still from years ago.