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Try again disabling your antivirus temporary, probably you will also want to disconnect your computer from the internet during the installation if you disable the antivirus.

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The problem is, the new Webroot interface sucks and I have no idea what to disable.

So, as I suspected, your antivirus deletes the installer when you try to install Racket.

Have you tried to right click and install as an administrator ?

Yep, same results.

Gave up, got it from http://www.gnu.org/software/mit-scheme/

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