Many times Google locks your Gmail account (with GTalk Account). The reasons for locking can be -
1. Suspicious Account activity
2. Due to server problem

To Unlock your GTalk Account

Please Follow these steps

1. Go to http://www.google.com/accounts/DisplayUnlockCaptcha Page.
2. Enter your Gmail Login and Password
3. Enter the image letters

It should unlock your GTalk and Gmail Account

Related posts:

1. gtalk not working on Blackberry If you are trying to use gtalk on your blackberry...
2. Access Hotmail, Live, MSN Mail from GMail Account Are you running out of time or getting irritated to...
3. Gtalk, AIM and MSN Online Web Messenger In the last post, I had covered how you...
4. Phone Verified Craigslist Account Do you live in some non American country say India...
5. Change Hotmail Password If you have found that you need to change your...