Before making an assumption statement such as your please be prepared to backup your thread. Avast actually has an extremely low false positive rating. Several other companies are far worse. Comodo has the highest actually. Just check out AV Comparatives. Also where did you download the Nvidia drivers from? Right from the Nvidia site? Post a link so I can test it myself. Other then that the title of your thread is extremely inaccurate and false.

http://chart.av-comparatives.org/chart1.php