The System Requirements Check was unable to write to the Documents folder ("My Documents" in Windows 7/8/10) of the currently logged in user.
In-Application tests need to store the assignment document somewhere and this is currently done in the Documents folder. If this location is not writable then the test will not work. Please check permissions on the Documents folder and try the test again.
If you need further help, please copy the logfile and send it to PSI support. Either use the button on the system requirements page or copy the text from the java console. Read this if you don't know how to open the Java Console.