How to solve %APPDATA% installation issue
This issue may occur if there is an incorrect setting in one of the User Shell Folders registry subkeys.
You can find more details and the procedure to solve this in this Microsoft KB article . We recommend you to try the "Fix it" tool first and then try again to install Bitdefender. Should you receive the same error message during installation please also try to "Let me fix it myself" procedure from the same article.