Whatever you do, DON'T delete Wordpad. It sounds as if something in your boot-up is calling Wordpad and if you delete it you will then generate different error messages about missing files. You need to find out what is causing Wordpad to open.
2Run the program msconfig and check all the tabs for any reference to Wordpad and uncheck them.
2 If this fails, try rebooting in step-by-step mode (press <F8> during the start-up process) and see what is being loaded when Wordpad opens. You may need to delete and re-install the appropriate drivers to correct the problem.