Is there any free software available to update drivers periodically?

Do not update drivers unless there is a reason such as features not supported by the current driver. Only get these drivers from the computer manufacturers site. Look at the details and see what the changes are between your current driver and the newer one. If you don't need the new "features" don't change the driver.

Many times a computer manufacturer will modify a driver for their particular models. If you go to the driver site you may see a newer driver but it may not be for your model computer.

When I try to operate Vista aero PC is asking for driver update grapgics driver to function properly.