Hi Friend, I am Alex. I have been working in a good firm, as a technical support executive for the last 4 years. I used to take care of all technical glitches over here. So I received lots of calls in a day regarding the various problems of the QuickBooks from the different users. However, the QuickBooks error 1603 is one of the most common among all. The good part of this error is it can be fixed quickly and easily on your own. However, if you are unable to fix it, you can connect with me through a call. I will help you to improve in a phone call.