don't know exactly what you did but a spouse can never be a dependent.
your spouse's personal data should be entered on the personal worksheet and not on the dependent worksheet
in step mode after entering some of your information you should see a question at the top of a screen which asks if you were married - select married. also, on the same page is a question about whether you want to file together with your spouse. Yes will produce a joint return. No will produce a married filing separate return. Even if you select no - married filing separately, usually the worst choice, you do not enter your spouse's personal info on a dependent worksheet.
if you are using other than the basic version and need more help, contact support. there is no free support for the basic version.
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https://support.turbotax.intuit.com/contact
800-446-8848
