hi Theerthagiri Rajakal,
can you try this ,will work out ....its an known issues in our co...
1) restart the machine twice will copy\replace the new CAF (add-in) files ..
2) If the user don't have rights to write on the below registry ,will create the issues..
HKEY_CURRENT_USER\Software\Classes ---kindly give full rights to this leg...
3) finally try the below ,
clear the vault plugins folder under the
"C:\Documents and Settings\[username]\Local Settings\Application Data\SolidWorks\SolidWorks Enterprise PDM\Plugins
above three solution will solve this issue ,try this and enjoy ....