Here are some basic registry tweaks you can do on your Windows Vista.
With AutoAdminLogon you can set your PC that whenever a user logs on to their account they only have to use their username and not a password.
Go to this location;
HKLM\Software\Microsoft\Windows NT\CurrentVersion\winlogon
This is a security hack that can be useful if you regularly use a communal computer. Everytime you log off from a PC your username will remain on the login page so the next user can see who has been on it last, DontDisplayLastUsername sets it so that the last user name will not be displayed.
Go to this location;
HKLM\Software\Microsoft\Windows\CurrentVersion\ Policies\System
If you get annoyed hearing the beep everytime you do something then turn it off.
Go to this location;
HKEY_CURRENT_USER\Control Panel\Sound
Do you want to remove the splash screen from Windows Mail, then just do this.
Go to this location;
HKEY_CURRENT_USER\Software\Microsoft\Windows Mail
Some people like the UAC (User Account Control) and some don't, if you prefer not to have it then you can turn it off in the registry.
Go to this location;
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
If you are one of the lucky ones with a computer powerful enough to run Vista's 3D graphics then you may want to speed them up a bit.
Go to this location;
KEY_CURRENT_USER\Software\ Microsoft\Windows\DWM
If you want to get rid of Windows Calendar then here is the tweak.
Go to this location;
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Windows
Here is a cool hack that lets you download more things at once, hence speeding up your IE browser.
Go this location;
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
If you have ever tried to encrypt or decrypt files you would know that it can take a while, with this hack you can set it so that encryption and decryption can be done with just a simple right click.
Go to this location;
HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Explorer/Advanced
Just as the title says this Vista registry hack allows you to change the name of the registered owner of Vista.
HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion
This will remove the ToolTips from showing up when you hover your mouse over something.
HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Explorer/Advanced
This will add some extra transition effects to your desktop, you need to have Aero enabled for this to work.
HKEY_Local_Machine/Software/Microsoft/Windows/Current Version/Explorer