Getting tired of sharing your computer with your parents and they just inspect everything you do in your computer like a real FBI???

Well, here is a trick to conceal your account.
It's not a full proof concealment where you can do everything but it's kinda cool to make one.

Create a user account in a control panel and create a user account.

Then go to registry editor and locate
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList

Create a new DWORD value and name it your account name (which you want to hide)
Don't change the value. Just keep it 0.
When you have done. Exit the registry editor and restart the windows.
Usually when the first user account, the normal account, the account that you are sharing with your family or the account that you used to create the hidden account, has the password, you will see the logon screen.
At logon screen, Press Ctrl+Alt+Del+Del and you user login will change to something like that of in windows 2000 or NT. Type or username and password and you are done.

Pl, correct me when I've made a mistake. (Both english and tech stuff)

Thx Guys,
Acro

Can I do it at Vista?

Yea of course u can. The same steps.