First you need to determine if you can use TurboTax.
TurboTax can prepare a Form 1040 return for US citizens and "resident aliens for tax purposes." It cannot prepare a Form 1040NR or 1040NR-EZ for non-resident aliens, and it cannot prepare dual-status returns. What type of visa were you under? Was this your first stay in the USA? Are you married?
Please provide the additional info, and I'll ask someone familiar with international filing to help you determine if you can use TurboTax or not. And if not, what all you need to do.
