i'm not sure it is illegal to post this.. but i've found out the reset your acheiver (i don't know about top score) if this post is illegal please delete this. Also, i found this accidently so those steps might look dumb.
Important notice here!!! it might be working in your computer or not. so don't blame on me if the program is messed up. i just want to show what i did to reset the program and that's it.
so, my os is Windows Vista, so i don't know it also works in other os.
1. find the icon of "DAT Achiever" on the desktop and right click it, then click "properties".
2. go to the "compatibility" tab, and uncheck the box said "Run this program as an administrator", then "OK".
3. now, if you double click the icon to run the DAT Achiever, it says some error to reinstall the program or something. Then go to the "control panel" to uninstall the program. (if you don't know how to uninstall the program, "start" -> "control panel" -> "Programs, uninstall a program" -> find "DATAchiever" and uninstall it")
*make sure you have the same program (as previous) to reinstall the program.
4. now, after you uninstall the program, you reinstall the program. (you don't need to restart the computer).
5. after you reinstall the program, go ahead follow the step 1 and 2 again and this time check the "Run this program as an administrator", then "OK".
6. click the icon on the desktop and run the program. you'll notice that the program is reset.
Like i said before, there might be shorter way to do this, but i don't want to mess up the program so that's why i'm unstalling it and reinstalling it.
hope you got it!🙂