Under the utilities section from this link
, install this -
ASUS PC Probe II V1.04.75 for Windows XP/XP 64bit/Vista/Vista 64bit Windows 7 32bit/64bit
About a new av - you can have a look in the security part of the forum to see what others say about them. MSE, Kaspersky, Avast are all probably alright.
That link has other drivers
like chipset, audio, lan etc...
Install them too if they're newer than what you have already.