double left click on one of the devices with the ? mark and see what the device status is then do the same for the other one with an ? mark. 3 posts in and you figure this would be the first thing anyone would tell you to do
unfortunetly sense its a dell the only easy option you have is to go to the dell website and search for the drivers for your specific model of PC. other than that you will have to find out what is the make and model of your motherboard and see if you can find the drivers that way. are you just downloading the drivers from the internet or are you also installing them as well?