Windows 7 - How can i create a new partition to mark it as active ?

I followed the limneos 's guide in this thread :
OSX and Windows 7 Dual Boot
And now i'm stucked at the step : Creating partition to install mac OSX and mark it as active . I really don't know how . I opened the manage as admin and right click at the drive E ( which i wanted to install my OSX ) and i saw no "mark as active" option .
Any advices will be appreciate . Thanks

hmm, you could try in a cmd running as administrator or better yet as such , in a recovery environment, diskpart.exe

list partition
select partition # (#= the partition you wish to make active)
active
(should return, bla bla is now active
exit


keep in mind, the active partition is the one normally which has the boot files I believe. If you change this, you might render your system unbooatable...
(erm, not to worry as long as you have winpe or winre... hence why I say, better to do it already in sucha an environment)