Some Windows components, such as the Accessibility Wizard, are hidden from the Windows Components Wizard. As such, these components cannot normally be removed. However, these components can be exposed by editing C:\Windows\Inf\SYSOC.INF.  Entries in the [Components] can be exposed by removing the HIDE parameter. (Don’t delete any commas, just the word “hide”.)  Once the desired entries are exposed, they can be removed.

The main hidden Windows components in Windows XP are:

Accessibility Wizard
AccessOpt=ocgen.dll,OcEntry,optional.inf,HIDE,7

Automatic Windows Update
AutoUpdate=ocgen.dll,OcEntry,au.inf,hide,7

COM+
com=comsetup.dll,OcEntry,comnt5.inf,hide,7

Communications components (including Chat, Hyperterminal, and Phone Dialer)
CommApps=ocgen.dll,OcEntry,communic.inf,HIDE,7

Distributed Transaction Coordinator
dtc=msdtcstp.dll,OcEntry,dtcnt5.inf,hide,7

Windows Messenger
msmsgs=msgrocm.dll,OcEntry,msmsgs.inf,hide,7

WordPad
MSWordPad=ocgen.dll,OcEntry,wordpad.inf,HIDE,7

Multimedia components (including Media Player, Volume Control, and Sound Recorder)
MultiM=ocgen.dll,OcEntry,multimed.inf,HIDE,7

Pinball game
Pinball=ocgen.dll,OcEntry,pinball.inf,HIDE,7

Tablet PC
TabletPC=tabletoc.dll,TabletSetupProc,Tabletpc.inf,HIDE,7

Terminal Server
TerminalServer=TsOc.dll, HydraOc, TsOc.inf,hide,2

Windows Management Instrumentation
WBEM=ocgen.dll,OcEntry,wbemoc.inf,hide,7