Thanks for your replies. It all makes sense now. I did notice that it says it requires Windows 8 but didn't realize that it was that specific as to differentiate between 8 and 8.1, I just thought that it meant Windows 8 and higher - oh well!

So, just to clarify for anybody else who gets caught out by this gotcha; on Windows 8.1 the "SkipMetro" DWORD value in: HKCU\Software\IvoSoft\ClassicStartMenu has no effect on Classic Start Menu, however, the registry entry that is relevant and is actually tweaked via the "Skip Metro screen" tick box in the Classic Start Menu GUI is the "OpenAtLogon" DWORD Value located at: HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\StartPage\
Also, regarding the other problem with inputting the text in the "Menu Items for the Windows 7 Style" in Group Policy Editor. I was copying and pasting the registry settings directly into it like you suggest, but I still received the error message. Fortunately, I have figured out what was causing this error. It seems that when pasting the settings directly into GP Editor, it adds an extra new line at the end of the text. For some reason GP editor does not like an empty new line anywhere in the text. After deleting the empty line from the bottom of the pasted text, the entries were accepted without error.
Thanks again guys for all of your help.
