According to Intuit, Error Code 1606 indicates that QuickBooks couldn’t access a network location when installing QuickBooks. The error message could also indicate that the Windows current user account is damaged.
The most common fixes for this error are to:
- create a new user account in Windows, log in using that new account, and re-attempt installation or
- disconnect from your local network and re-attempt installation
If you’re attempting to install QuickBooks to a shared folder, you should also check that the currently logged in user has full control permissions for that folder.
If you are attempting to install QuickBooks under Windows Vista, you need to have User Account Control (UAC) turned on. Consult this Intuit knowledge base article on the subject of turning UAC on. Note that after a change to your UAC setting, you’ll need to restart your computer.
For more information on resolving Error Code 1606, consult this Intuit knowledge base article.