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[CarterJohnson]

To check whether your desktop is being back with the QB error 1603 code code just check these signs.

There are chances of a locked company file being present in your QuickBooks.
You might fail to get the permission to install any update in QuickBooks.
There are chances that the temporary folder of Temp Windows might be full.
You might be using an older version of the QuickBooks.
You must be using an outdated version of Windows.
Presence of a damaged Microsoft C++ and MSXML component can be there.

You may also read: QuickBooks Error PS033