From TechiWarehouse.com

XP hides some system software you might want to remove, such as Windows
Messenger, but you can tickle it and make it disgorge everything. Using
Notepad or Edit, edit the text file /windows/inf/sysoc.inf, search for
the word ‘hide’ and remove it. You can then go to the Add or Remove
Programs in the Control Panel, select Add/Remove Windows Components and
there will be yourprey, exposed and vulnerable.