Where is a detailed description of what are acceptable operating systems, browsers, additions and other requirements for the TOEFL practice test? I have been trying different browsers, operating systems (Windows 7 and Windows 8.1, Chrome and even with the self test and the audio test passing, that actual test fails.
TOEFL system check
You can do the system check from here: i-courses.org/check.html . Also, you can take the free demo TOEFL test to see if it runs properly.