In order to properly install the Keraleeyam program on your computer which runs Windows XP, you need to use Administrator rights. If you don't install the program in this way, you won't be able to run it. To do this, first go to Start > Control Panel > Add/Remove programs, and uninstall it. After this is done, reboot the PC and log in with the Administrator account. From there, install the product and run it. You should be able to overcome the problem.