How to solve the Pidgin GTalk client not working on Windows 7 problem?

What solved this error for me was logging into http://accounts.google.com/ Then under the "Signing In" section I chose "Access for Less Secure Apps". It was disabled, and once I enabled that option, Pidgin was instantly able to connect.

Look at this post This worked for me:

Go to your google accounts by logging in to http://accounts.google.com/ In the ‘Security’ menu (left side of the window), go to the 2-step verification section Under this section.,

click the ‘Manage your application-specific passwords’ link. Sign-in again (if prompted)

Set any name relevant to the application. For example, pidgin-messenger and hit the ‘Generate Password’ button. Copy the password generated (along with the spaces, it doesn’t matter) and hit the ‘done’ button.

Now, hit the ‘Modify account’ button on the Pidgin window, paste the copied password in the ‘password’ text box and click the ‘save’ button. You will again be presented the ‘Add accounts’ window. In this window try again to tick the ‘Enabled’ check box

Make sure the connect server is talk.google.com

Check the password (Duh?)

Try unchecking the security, just to see it it will connect without it.

update pidgin?