Metro Start Screen or Metro UI is not accepted/liked by Windows 7 users that’s the case ,after installing from Windows 8 Developer preview they want to disable Metro UI as Win8 can’t offers any way to access Windows 7 type Start menu on Windows 8 (short Start menu does exists, but its pretty useless), clicking on Start button activates Start Screen only and short Start Menu doesn’t. Windows 8 Start Menu Toggle is a freeware portable app that disables Metro UI and enables classic menu on Windows 8.
Using Windows 8 Start Menu Toggle
Download and extract program archive contents to a folder. Windows 8 does asks you to download and install .Net Framework 3.5.1 runtimes, if you’re stuck on download update window read the below article
Windows 8 Start Menu Toggle works on Windows 8 Developer Preview.
Enable .NET Framework 3.5.1 on Windows 8 Developer Preview to Run Applications