I use Windows XP Home edition.

Recently I went to uninstall a Program and noticed that the "Add or Remove
Program" functionality does not respond.

If I click the icon in Control panel there is no response.

And if I try to access the "Add or Remove Program" functionality by for
example deleting a desktop icon the same problem - no response.

I'm not sure if I have done anything to the PC to restrict access to the
function - I don't believe I have and I don't want to go to the trouble of
attempting to restore Windows XP if for example there is something relatively
straight forward I could do to restore the function.

Can anyone help?