Hello, all. My name is PaulE, and I function as a customer care attendant. 'QuickBooks error 3371 code 11118' is a common problem that many QuickBooks users report. The most typical reason for the 'QuickBooks error 3371 code 11118' issue is that you are running an old version of Windows. QB may not be compatible with earlier versions of Windows, and a network issue is possible.