You can A) "borrow" a friends code assuming that his computer licensed to the same type of OS. for home edition, just about any computer is licensed.
For XP pro, you will have to "borrow" from a workplace or an organization such as schools.
If you don't have access to either.
You can find cracked/illegal codes that will work but Microsoft DOES fight against non-genuine product keys. If you do you computer updates, make sure you don't update the genuine authenticator. If you do, it may lock up your OS until you purchase or find a legit product key.
I had this problem before with XP Pro.
My Dell Dimension 4400 with Window XP Home edition crashed and could no longer boot up. If I replacing parts of my computer with another used Dell computer of the same model, would I be able to use my original reinstallation CD to get it running? What Do I need to do exactly? Since the motherboard is replaced by the motherboard of another computer of the same made, would it be a problem with the so called COA issue? Please explain in more details since I am not familiar with these. Thanks. -question by Kate
Kate, your computer hardware has nothing to do with the product keys for your software. If you have a product key for Windows XP Home, and you still have a version of Windows XP Home installed. That product key will work.
However, most product keys are licensed to be used on one system only, but there is nothing stopping you from using it on multiple systems.
look this problem
Windows Problems \"new Series\"- Xp Home Edition Activation Issue
I've installed Windows xp home edition service pack 2 into my computer and it immediately asked me activation key
Then every time when I start my pc it asks me
-question by Alison
Allison, just to make sure you didn't know, Windows XP has sort of 2 "activation" systems and on most systems, both of them are required.
During the install of Windows XP, it will ask you for the product key.
If your system is installed, most systems will request an activation. The icon is usually a keyring with a couple of keys. If you have access to the internet, clicking 'Activate over the internet' should work and do it automatically. If you do not have access to the internet, you can activate Windows over the phone.
Edited by Sakizen, 04 February 2010 - 07:34 PM.