The best way to troubleshoot any of the Quickbooks errors is by rebooting or restarting your computer. Restart your device and then try accessing the Quickbooks A damaged hard drive. The company's name is too long or extensive. An obsolete operating system. QuickBooks POS, QuickBooks Won't Open, QuickBooks Won t Open, QuickBooks POS System, QuickBooks POS Hardware QuickBooks Desktop is not installed correctly. Problems relating to the installation of QBO can prevent you from opening it. Its installation may either be corrupt or may have received damages.