QuickBooks Event Log Error 4 is caused due to the damage of system files in QuickBooks. It can be generally seen due to .NET Framework 4.0 SP 1 issues, if you are Microsoft Windows 7 OS user. Here are going to tell about everything about QuickBooks Event log Error 4 Reasons and Solutions Steps. If still facing the same issue or QuickBooks is not working. Contact Our Support team to Instant Help, Just Dial +1-800-865-4183.