|There are several:|
The machine ID is a unique number/letter identification made up of the user/owners name and the identification of several other installed components such as the operating system and CPU identifier and I believe the NAT card Identifier as well and the motherboard
It can be viewed by going to the System Properties
( My Computer > Properties) and looking under the registered owner...the 20 digit String is your computer ID..
It cannot be changed or altered. Doing so would cause computer to stop responding and cause windows to become unactivated...similar to changing too many hardware devices.
What you might be referring to is the computer name an it
It can be viewed and changed by going to
My Computer > properties > Computer Name tab and you will see the Full Computer Name to change it click the change button.
For networking purposes the computer ID is your MAC or Physical address and can be found by:
start > run and type cmd enter
and in the command prompt type ipconfig /all and look for the 12 digit code for the physical address.