files cannot selecting according to alphabet keys on keyboard layout

Could you explain the issue properly?

In explorer window Press Alt button on keyboard. It will show you the File toolbar - there you will get view option. Click on View and On view menu there is the "Sort By" option I think you're looking for.

sorry for bad English i try to explain

just try open explorer window go to any folder (which have multiple files ) then press any alphabet keys on keyboard like press M . according to alphabet M folder name (Muisc) will select .....this function is disabled automatically on my windows 7 . how to activate ????

Might be a registry error. Create a new user/admin profile and recheck using that.