Change computer name in Vista
If you have Vista already installed and you didn’t configured the computer name during the installation, then you probably have a generated computer name like this: WIN-56FTP76PC. This name usually doesn’t easy to remember and it’s hard to use. Besides this the initial workgroup is also not good for you. Fortunatelly it is quite easy to update these settings.
Note: Don’t forget that changing the computer name will require to restart your computer.
Click on Start menu and select “Computer”
In the new window move the mouse cursor over the computer icon in the bottom left corner. Use right click and select “Properties” from the menu.
Now click on the “Settings” link.
On the “System Properties” window select the “Computer name” tab. On this tab select the “Change” button.
In the new dialog window enter your required computer name. Besides this you can edit your Workgroup name as well. If you are ready, click ok and restart your PC.