not installing plugin ,showing 1603 error

The infamous Windows Installer 1603 error is usually caused by a previously-installed version of a program that wasn't completely uninstalled, which leaves behind corrupted installation data. It can also be caused by a downlevel version of the Windows installer program itself. Try this (you may want to print this out, since you need to close your web browser to do it): Close all your web browser(s). Go to Windows Control Panel, Programs and Features, where you will find a list of installed programs. Look for, and then click to un-install, the "Google Talk Plugin" entry. If you get an error message, or otherwise can't uninstall it this way, go here, to download and run Microsoft's automated "fix it" tool: http://support.microsoft.com/mats/Program_Install_and_Uninstall/ Now, go here, to download and install the latest version of the browser plugin. Don't be concerned that the plugin has been renamed to the "Hangouts" plugin. It supports Hangouts, (formerly Talk) and Chat, and calling from Gmail: https://www.google.com/tools/dlpage/hangoutplugin Log into your Gmail (not GV) account, and click the gear icon to get to Gmail settings. Click the Chat tab. Enable Chat, and then select, configure and test your audio devices (headset, or microphone and speakers). Now, you should have the ability to click the tiny telephone handset icon next to your "avatar", or image representing your user ID, to make a call, either via the old chat, or new hangouts method. or If you want to continue using the CALL button from Google Voice to make calls from your computer, then (as of today, 8/11/2013, subject to change), if/when you are invited by Google to "Try the new Hangouts", do not agree -- this breaks telephone calling from GV or Google Contacts. Enjoy making calls from Gmail.