You can use TurboTax from anywhere in the world where you have internet access. But---you can only pay for the software using a U.S. based credit or debit card. And if you are getting a refund, the IRS will not make a deposit to a foreign bank. They will only make a direct deposit to a U.S. based bank account or they will mail a check to the address on your tax return. If your only income will be Social Security and "some investment income" it is not clear whether you will even need to file a tax return. That will depend on the amount of investment income you are receiving.
Who has to file?
http://www.irs.gov/uac/Do-I-Need-to-File-a-Tax-Return%3F
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