mistakenly i tookmof a program from the pc called microsoft 2003 home edition. how can i reinstall it? ?

how to reinstall the program microsoft 2003 home addition. need it to open some of my emails . Try a system restore on a date you know it was working ok. how to do a system restore in XP: http://support.microsoft.com/kb/306084 If you have Vista: http://support.microsoft.com/kb/936212/en-us