Usually occurring during program upgrades or installation, QuickBooks Error 1601 is brought on by problems with the Windows Installer. Incorrect system settings, corrupted or missing data, or issues with security software could all be the cause of this message. It can be fixed by reinstalling QuickBooks, fixing the Windows Installer, or executing the installation as an administrator. The number for our QuickBooks Experts team is 1.855.738.2784.