Why does Wubi.exe for Ubuntu 11.10 not run on Windows 7 64bit?

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http://askubuntu.com – I installed an older version of Ubuntu before with the Wubi installer. I then did an upgrade of the Ubuntu to the latest 11.10 version but this did not work well. Icons were missing in Ubuntu and it was pretty messed up (with no option to shut down Ubuntu etc.). I therefore completely uninstalled ubuntu from within Windows 7 64 bit and downloaded the new Ubuntu 11.10 Wubi.exe. When I now execute the Wubi.exe I get the normal Win7 "User Account Control" notification asking if I want to allow the program to make changes to my computer. I answer with "yes" and now the installer should start. But (HowTos)