Before you get rid of Win 8 which is horrible , I read last night Windows has released a patch 8.1 which will bring win 8 to operate like win 7. It is going to be a free release available soon.
Now as for wiping out Win 8 and reverting back to Win 7, yes you can do it but you must download all the drivers necessary for all your hardware to function properly. If all your hardware on your machine has drivers available for win 7 you should have no problem. Be sure you check first or your machine will perform very poorly.
You can run two OS at the same time with a boot screen choosing which OS you want to run at the time but that is a little more complicated doing it. Not hard just a little more with the installation.
My suggestion unless your real comfortable with reformatting etc, is to wait just a short time and see if Win 8.1 will solve your problem. Good luck with Windows.....