As far as i know, although hackshield is not required anymore for the game, if you have installed the game before, you will still have hackshield files on your computer.
So, You have to manually remove it if you haven't already.

Here is the hackshield removal thread that might be able to help you if you need any :)

http://fm.en.kupaisky.com/Community/Forum/View.aspx?num=3807&searchtype=0&pagecount=0&searchvalue=&sort=5&category=E01&page1=1

yeah, but still, won't it be easier if the installer won't have to install the hackshield program at all?

I mean, installing and uninstalling would be a waste of time.. besides i dun wanna mess with my registries.