When QuickBooks is installed, updated, or launched, QuickBooks Error 1334 happens because installation files are either corrupted or missing. Error 1334. The file cannot be installed is one of the warnings it shows. You can use the QuickBooks Install Diagnostic Tool, repair the installation, or do a clean install to resolve this issue. Do you require QuickBooks assistance? For expert assistance, give 1.855.738.2784 a call.