Program to help with privacy?

[Vincent Atari]

I'm having some problems with privacy on my computer, and I'm looking for a program that would be able to hide another program from the taskbar and such. I've searched around but cannot seem to find much of anything.
If anyone knows of one, feedback will be much appreciated. :t

[Kandar]

Some more information would be helpful.
What OS are you running and do all users share the same logon profile. What do you want to hide and from who?