This petition is stupid; I'm a feminist, but I did get a few giggles out of the videos, and I wouldn't mind more.
Also, it's worth noting that the women in those videos did it consentually; they weren't forced into doing it. Also, put it in their perspective- if MSI were to stop making these ads, it would be really bad for them since they may be out of a job. In addition, if you're going to call this objectification, don't why don't you bycott trade shows as well, such as CES, and Computex, since there as well, there are, according to your opinion, an objectification of females in the product booth; stop watching all the coverage on YouTube associated with those events as well.
Personally, I believe the person whose doing this is just seeking attention and looking to create an unnecessary frenzy; if you don't support MSIs advertising, it's simple- don't buy their products, but don't dictate what a company can and cannot do; you're invoking on the freedom of expression and artistic creativity and design by doing so by limiting what the artist, in this case the ad director, can or cannot do.