[yuhong]

I think this is because a lot of people didn't like Win8.

[toupeira]

If that was the reason they wouldn't try so hard to give the impression that it is indeed running Windows 8.

[mahouse]

They probably manufactured all the computers with the W8 stickers on them and then hastily dumped a W7 disk image on the hard disk of each one of them to stop users from complaining. But yes, the fact that the computer has no DVD drive to upgrade to W8 from the DVDs is a bit wrong.