Invisible program in windows

Its really strange to say that no of programs are there in windows as a invisible or hidden program even when they are quite useful to us! Here is the list of some of them which might serve you some thing to access better windows!

1. Private Character Editor :
Used to edit fonts, etc.
** start>>Run
** Now, type eudcedit
2. Dr. Watson :
This an inbuilt windows repairing software !
** start>>Run
** Now, type drwtsn32
3. Media Player 5.1 :
Even if you upgrade your Media Player, you can still access your old player in case the new one fails !!!
** start>>Run
** Now, type mplay32
4. iExpress :
Used to create SetupsYou can create your own installers !
** start>>Run
** Now, type iexpress