Your post is a little vague in that you didn't specify exactly what the problem with Add or Remove Programs is. Like Cheator already asked, is the feature not available in the Control Panel? And what do you mean by "It won't work"... when you click on the feature nothing happens? Since you're running the Pro version of XP, you may want to check in the Group Policy Editor under...
Local Computer Policy | User Configuration | Administrative Templates | Control Panel | Add or Remove Programs
Without knowing exactly what your problem is, double click a few of the settings in the RH pane-->"Explain" tab for an explanation of what each setting does i.e...
Remove Add or Remove Programs
Hide Change or Remove Programs Page... etc. You might possibly find the answer from within the GP Editor, as to why the Add or Remove Programs feature isn't working for you.