What many people are of the impression of is that they must have the latest drivers, this is often a misconception.
Driver updates are often released to address known issues and unless you are having that particular issue you do not need the update and installing the said driver can actually create the very issue it is intended to resolve.
http://lifehacker.com/5912682/do-i-really-need-to-update-my-drivers
As an asides, other important software such as the OS and AV programs such as Avast & the many others available should always be kept up to date to keep your computer performing to the best that it can while ensuring that it is also secure and keeping out the bad guys.