i have some problem with my gpu driver, i was restart my pc after updating from windows update, and while waiting for pc restart, at screen appear percent that currently updating..after restart is done, suddenly my gpu driver is missing, i need to install it again..sometimes when i shut down my pc, and turn it back after a few hours, same thing happen again..please somebody help me.. i used sapphire HD 7850 on mobo msi z87-g43 gaming..just bought my mobo in about 2 weeks ago.