QuickBooks closes unexpectedly when you email large reports, switch between centers, or open specific company files, indicating damaged program components or Windows conflicts. This detailed guide explains how to update QuickBooks Desktop, rename .ND and .TLG files, run File Doctor, and rebuild data to reduce crashing. Learn practical steps anyone can follow without risking data loss. If QuickBooks keeps closing on different workstations, dial +1-866-408-0444 to get fast crash resolution assistance.