Windows 7 - Creating A New Partition

Ok, so, I'm trying to dual-boot Windows 7 with Mac, but I can only create a partition that's ca. 9500mb big. This was when I had 23gb of free space, then I relocated the space into the C Drive, but when I tried shrinking the space again (this was when I had 70 gb free) it said I could, again, only make the partition ca. 9500mb large.

Any ideas/hints with this or just dual-booting in general. I've never done this before, so - we'll see, but I do have everything backed up and my original Windows Vista disk and the Windows 7 upgrade disk. (I'm runnung Windows 7 Home Premium).

Thank you in advance!

Use a tool like Partition Wizard to adjust the partitions to desired size.

Ok, thank you. I now have one las question thoug: If I have Windows 7 and want to make a partition where I run a Mac OS (So, I dual-boot the two) should I make it a primary or logical partition and what is the difference between the two? And what about the file system (NTFS, FAT, FAT32, Unformatted) and the Cluster Size (Default, 512 bytes, 1kb, 2kb, 4kb, 8kb, 16kb, 32kb, 64kb)?

Any one?

Here are a couple of threads you may find useful.

Dual Booting the Wind – OSX and Windows 7|Gear Diary

How to Dual Boot Windows 7 and Mac OSX