How do I remove my internet explorer

In fact I have my computer with a corrupted version of internet Explorer 5.5 and want to replace it with ie 5 when I try to remove this version perhaps because of some files were deleted I refuses completely so what can I do to remove it completely.
Because even If I try to install ie 5 It detects the existence of a newer version and fails to install what can I do to install my ie.
Thanks