Error code TT403 means that an error has occurred while reading your return from disk. So your file could be damaged or corrupted.
If you have a backup of your file on another drive or disc, you can try opening that instead. You can also try using the backup file that TurboTax Cd/Download automatically makes. To do this:
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Open TurboTax.
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From the File menu, select Open.
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In the File name field of the Open dialog box, type *.ttbk and then click Open.
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A list of backup files appears in the Open dialog box.
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Select the file you want to open and click Open.
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Save this new file right away as a .tt18 file (or .tt17 for 2017). To do this, from the File menu, select Save as and then click Save.
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TurboTax gives it the same name as the original file but adds a copy number in brackets so you can differentiate it from the original corrupt file.
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