Windows 7 install?

Hello Everybody, I'm a newbie and this is my first post. Recently I had someone build a computer with Windows 7 Pro 32-bit for me. Everything works fine. After 30 days I get a notice on my screen saying this is not genuine software........ He never gave me a code or key but during that 30 days I was able to update and install SP 1. I can't get in touch with the person who built it so I've bought a copy of Windows 7 Pro 32-bit. Is there anything I should know about installing over the old Windows 7 and what about drivers? This has been just a big HASSLE! Any help would be greatly appreciated and thanks.:confused::mad:

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