Turbotax recommends 4GB for desktop. however, consider that you may be running other apps that are using up available memory.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-system-requirements/minimum-syst...
check task manager. start typing task into the windows 10 search box to see what using your memory. you can stop unwanted tasks.
your other options are online or to upgrade memory (not always possible)
