You will say that it is not possible to use a operating system (Windows Vista) al Microsoft without having license. It seems that the solution to use Windows Vista Legal Without License is offered in a Documentation Tehinica a Microsoft.
How can you run Windows Vista without license, but legal.
The procedure below must be done before the expiry date of the copy of Windows Vista.
1. First of all you have to install a copy of the Windows Vista and SA operating system Don't activate it.
2. Go in Start -> Start Search If you taste regedit, then press Enter. Will open Registry Editor-ul. (Click on the image below.)

3. On the left side of the register editor sailing up to: HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows NT CurrentVersion SL .
4. Select the key Shipping, do click-right, select Modify… and change the value of the key default 00000000 in 00000001. Replace 0 with 1. Save the change and close the register editor.

5. Open Command Prompt with privileges of Administrator (Start -> Start Search -> cmd & ENTER) and then type the following command:
slmgr-rearm
After you restart your computer you will notice that the expiry date of the copy of Windows Vista was postponed. When you are near the next expiration date, repeat the scheme above :)