Windows 7 came out this week. After the debacle with Windows Vista, the operating system nobody liked, Microsoft wants to conclude the nightmare. And so it runs a campaign carrying the theme "I'm a PC and Windows 7 was my idea".

Many ads use a slogan, "1 billion = 7", suggesting that the billion people who use PCs helped bring forth the new operating system.

So far at least two-thirds of corporate computers were still running the nine years-old Windows XP. If you are either a corporate or home user what would you do?

Before you answer, the ugly truth: upgrading from Vista is easy, but upgrading from Windows XP involves a scary "clean install". It means, moving all your programs and files off the hard drive, installing Windows 7, then copying everything back on again. It's all-day hassle. Good luck.

Another insane Windows-style thing: there are five versions of Windows 7 -Starter, Home Premium, Professional, Enterprise, Ultimate. Very cool.

And there is more. Believe it or not, Windows 7 doesn't come with an e-mail program. Also there is no software for reading PDF documents, managing photos, editing videos, maintaining a calendar, managing addresses, and chatting online. You are supposed to download these free apps yourself from a Microsoft Web site.

To add more confusion, Windows 7 installer will delete existing Vista copys of Windows Mail, Movie Maker, Calendar, Contact and Photo Gallery.

Of course, it still requires antivirus software. Windows 7 is still a Windows.

If I were you, I will remain with XP. And when getting a new computer, make the switch to a Mac. it is simple: XP at work, Mac at home.

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For the brave people who still think on upgrading to Windows 7, here you are a useful video I found around. Please see it before to jump into that unexplored territory. Also, check out this comprensive coverage on what Microsoft's new OS means. It is one of the best I read.

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For my Mac colleagues, this "Broken Promises" laughtful Apple's ad video.

 More funny ads here.