Try Windows 7

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Windows 7 beta is ready to test drive now. 

https://www.microsoft.com/windows/windows-7/beta-download.aspx

I have installed it on two of my computers. So far, I feel good about it.  And I am trying to install it on my home computer.

If you want to use TTS,  the TTS voice inside the beta version is the "Microsoft Anna". You can have a try with it as well.