AricCougar

Partition Issue (Adding Vista x64 to Vista x32 1TB Drive)

My 1TB drive is set up as follows:

C: Vista x32 IE7 + VMwares 300GB (Primary)
D: Vista x32 IE8 50GB (Primary)
E: XP IE6 50GB (Primary)
F: XP IE7 50GB (Extended)
G: XP IE8 50GB (Extended)
H: Win7 IE8 50GB (Extended)
Unallocated 60GB

I need to put a new Vista x64 in 50GB of the remaining Unallocated space but keep getting this error when trying to partition/format it: "Disk Management: You cannot create a volume in this unallocated space because the disk already contains the maximum number of partitions."

I understand that we only get 4 primary partitions. How can i add this unallocated space to the Extended Partition, and thereby make a partition within it to load Vista x64 to boot up like all the others?

Appreciate any quick ideas. Thanks.