These instruction will solve your problem:
https://www.blogsdna.com/18191/enable-classic-menu-on-windows-8.htm
If your afraid to edit your registry (Windows 8 doesn't enable registry changes til its confirmed windows will still run after the change so its pretty safe) There is programs to activate the start menu, just watch out for a few that do have trojan viruses in them.
Manually is probably the safest atm. (Or check Microsoft's Forum for a legit program to change the key for you.)
***NOTICE*** This also disables the MetroUI, so if you like that feature, it is impossible to have the Start Menu with it at this time.