>Please I'll admit I know nothing about trademark 
>law, so do tell me all about it and why the 
>word "April" could possibly be trademarked
You can't register a word that is used in the same 
sector in which you want your product to be in.
example: You can't call a fruit machine "Apple", but you can call a computer system "Apple".
The windows trademark is different. It has nothing 
todo with the fact that those are "normal english 
words". The problem with the Windows trademark 
is that "Windows" was used to describe certain 
functionality on a desktop OS even before Microsoft 
registered it.