Are you confronting the error code while installing the QuickBooks on your computer? If yes then this error code 1603 appears with an error message that says "QuickBooks update installer has encountered an error". You can even try to resolve this issue on your own by turning off the firewall, by scanning the PC from the malicious program, etc. But at times this error can give you really tough time, but you can resolve this error by calling QuickBooks Helpline Number that stays available 24 * 7 round the clock in a year. The customer care team will make sure that they resolve the error instantly so that you can continue with your work.