Follow these steps for yahoo messenger :

  1. Go to Start —-> Run . Type regedit, then enter . 2.Navigate to HKEY_CURRENT_USER ——–> Software —>yahoo —–>pager—->Test 3.On the right pane , right-click and choose new Dword value . 4.Rename it as Plural. 5.Double click and assign a decimal value of 1. That’s it done!!Now close registry and restart yahoo messenger .For signing in with new id open another messenger. for google Talk : For any Gtalk fans want to run multiple instance Gtalk messenger account at the same times. Here is a simple trick you can run multiple instance of GTalk Account by adding or enter some command the GTalk Messenger software and run it. Now double click on the shortcut and you will see one more instance of Gtalk running on your PC. You can do the same even for other gtalk shortcuts in your pc.