How to remove the 'Choose an operating system' Windows 8.1 Preview boot screen after upgrading to Windows 8.1?

windows-8.1 multi-boot windows-8.1-preview

I found this and it worked for me:

1) Press the Windows Key (or Windows key plus 'R')
2) Type msconfig then press return (or click Enter)
3) Choose the Boot Tab
4) Delete entries other than the Current OS
5) Restart your machine and it should go straight to correct OS

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