Re: The only 'advertising' I see ...
I'm not a big fan on Windows but i've re-installed several times and never had that problem.
Have replaced HDD and graphics card as well as updating to 64 bit. The HDD rebuild accepted the same key without a fuss, the graphics card change didn't actually require anything and the 64 bit upgrade required me to call a number and deal with an IVR system.
Are you running an OEM version of Windows? I'm using a boxed Win 7 Professional version.