RE: Vostro 3450 Win7 64 bit Pro Missing Drivers (support assist no help)
Install the drivers under "chipset" -- starting with the intel HM67 driver, followed by a reboot:
Under System Utilities, install the motion sensor driver.
For bluetooth and network, go to "Original Configuration" and identify the card installed. Then install the corresponding drivers from the link above. DO NOT just guess or try at random - you must identify the driver and install the correct one.