Suggest a Software for this pupose

[boom2709]

please suggest me a good software which i can use to hide certain programs while they are running and/or block certain programs to be accessed by anyone apart from me.
i would like to mention here that i use windows XP.

[Amir.php]

Lots of software available.some of the best are:
1. Eusing taskbar hide.
2. Hide window plus
3. Outta sight
4. HyperHide
some are freeware and some shareware. search on google with name i specified and download in which you interested.