Good day, everyone. I'm Alex Poter, and I'm an IT customer care agent. 'QuickBooks error 3371 code 11118' is a typical issue that many QuickBooks users encounter and complain about. The most common cause of the 'QuickBooks error 3371 code 11118' problem is that you are using an outdated version of Windows. Previous versions of Windows may be inconsistent with the newest release of QB.