Hi Abhijit,
See the below link.
http://help.sap.com/saphelp_nwes73/helpdata/EN/d9/4a91ac51ea11d189570000e829fbbd/content.htm
Is this error coming on other m/c also ?
Also try to uninstall the SAP GUI and after uninstall delete the SAP Folder at your installation location and after that restart the system and then again install the GUI and its latest patch.
Regards
Ganesh Datt Tiwari