You searched for hours, but you should hone your skills ;)
Iirc the solution is in a comment in the installation requirements page in the online manual (or the installation guide pages): just disable the domdocument extension in php.ini. It's a legacy (read: php4) extension that has been supercdeded by the dom extension in php5. Funny things is when both are enabled you get no errors, but domdocument takes precedence in defining the domdocument class, giving you a borked version. Even funnier is that xampp guys still insist on enabling it by default...
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