Question : Enabling Windows Vista Aero

1) I have Windows Vista Home Premium
2) My PC score is higher than 5
3) The help says: Make sure that the color is set to 32 bit, the monitor refresh rate is higher than 10 hertz, the theme is set to Windows Vista, the color scheme is set to Windows Aero, and window frame transparency is on.
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I've done all that, BUT the "Windows Aero" color scheme is not there! See the screenshot:
http://ypoviny.jirinovotny.eu/appearance-settings.png

What should I do to enable the Aero?

Answer : Enabling Windows Vista Aero

What graphics card do you have JiriNovotny?
There are problems with some models.

It's possible that these links are relevant.
http://www.acc.umu.se/~storm/static.php?page=statiskapa&PHPSESSID=27ecab8dafc5ecfa96cbcfc2bada316d
https://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1148379&SiteID=1