Windows 7 is pretty much improved when it comes to it's driver database so if your device manager is not reporting any issues I wouldn't panic about it. You are probably on a generic driver for you monitor now too Linny (remember that? If it's the same PC?) The right driver will give you more resolution options. The first drivers that should be installed after a clean install are the chipset drivers followed by sound and then network (in that order) and yes, there would be setup files on your driver disc that you would run. Your printer driver\softwware will need installing too if you have a printer attached? again, Win 7 may have popped some generic ones in for you?
As you mentioned, it's now most of the work begins, getting all your Apps back in and tweaked to your own liking, that is the most time consuming aspect of a reinstall, and as your are finding out that's why a good image of a clean system is such a worthwhile and valuable exercise ;)