The problem you are having is likely due to changes that affect your Internet connection for secure transmissions. These settings can be changed by updates to Windows.

Check your TLS settings:

1. Close TaxAct.
2. Open Internet Options. You can type "Internet Options" in the Windows search bar near the Start menu.
3. Click the Advanced tab on the top right of the Internet Options window.
4. Scroll to the bottom of Settings.
5. Make sure the box next to Use TLS 1.2 is checked. Also make sure that no other TLS box is checked, and that no SSL (secure sockets layer) boxes are checked (click the Checkbox(es) to check and uncheck).
6. Hit the Apply button to save any changes. Then click OK to close the window.

You can also try:

1. On the Internet Properties box that opens, on the General tab, look for the "Browsing history" section. Click the Delete button.
2. Make sure the box next to Form Data is checked.
3. Click the Delete button below and you will be returned to Internet Options.
4. Click the Apply button in the lower right corner.

You can also check Internet Options > Connections tab > LAN settings button: make sure no option is checked.

The problem could be momentary, for example due to a wireless connection. If the problem persists, you may need to check Windows network connection, user account permissions, Internet security zone or Windows firewall settings, or the settings of any security or personal firewall software you have.

The problem could also be due to your router and you may need to consult help or resources about the router administration. Any of these can block certain programs or types of Internet traffic, so that you may be able to use the Internet with other programs in some ways. Sometimes rebooting the computer, or router, can restore the connection configuration.