Precision XOC
v6.0.8 (the latest as of now) as well as v6.0.7 may ask you for First Name, Last Name and Email Address but the Serial Number is no longer a Required Field as denoted by an asterisk (look closely)..Scroll down on the download page to see the Version History..Is that not true for you?..Maybe right-click and running the installer and Precision as administrator might help..You can use/try PrecisionX 16 too.
Other than that, stick with what works..Afterburner is recommended when Precision fails, or otherwise.