Weird problem at install (extended partition)

Hello,

Sorry if the question is in the wrong place..
I want install FreeBSD beside Windows 7 and Slackware 14.1. I've download FreeBSD-10.1-RELEASE-amd64-memstick. Everything is OK till the hard disk partition. I can't create or modify or delete the free space in my HD. Also I tried to create FreeBSD partition but I can't install FreeBSD on it because I can't modify it and add /.
Also I get this error:

 
You cannot install FreeBSD in an "extended" partition, it has to be a primary.
 
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