You can get a $600 home energy credit for the windows. The credit is NOT per window it is based on your total cost to replace the windows.
To enter Home Energy Credits -
Click on Federal Taxes (Personal using Home and Business)
Click on Deductions and Credit
Click on I'll choose what I work on (if shown)
Under Your Home
On Home Energy Credits, click the start or update button
Or enter energy improvements in the Search box located in the upper right of the program screen. Click on Jump to energy improvements
Yes, qualified exterior windows are an eligible expense under the Energy Efficient Home Improvement Credit (EEHIC).
Here is some information from TurboTax about the energy credits available: What Are Energy Tax Credits?
@DoninGA provided a great how-to on entering the credit!