Yup,
You can simply go ahead & take 3rd, 4th time on the same software, 1 or 2 questions are repeated but that should be fine.
Some people on our forum also tried out uninstalling & installing it again (also deleted the directory in 'program files') & found that it offers different questions on new installation. You could give it a try.
Also, see if you can grab power prep somehow but if you are using OG10 PP may not help you...
Cheers,
Vivek