I recently installed the video chat software for GTalk and tried to use it. I tried installing about 3 times, but again when I try to go for a video chat, its the same. I closed the browser, but still the same.
Solution that worked for me
I uninstalled the software by going to the Add / Remove option in Windows XP. Then go to regedit and find out the installation path of GTalk plugin. It will be in HKCU\software\Google\ Google Talk Plugin
Delete that folder and re-install the software. Clear your browser data and close your browser. Now it should work


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Thanks Kishore for trying to helping out people on this site.
regarding the GTalk installation problem, It’s better to follow this procedure:
1) Exit Gmail.
2) Go to Start -> Run, and enter this command: “%USERPROFILE%\Local Settings\Application Data\Google\Google Talk Plugin” (note: this is
for XP, the path may be slightly different on Vista)
3) An Explorer window will open. Delete the file
“googletalkplugin_port”.
4) Log back into Gmail.
Ref:
http://smsoftdev-solutions.blogspot.com/2009/05/gmail-voice-and-video-chat-installation.html
http://www.google.com/support/forum/p/gmail/thread?tid=3ba1a94760977676&hl=en