Trying to dualboot Windows 7 and Ubuntu

[mKTank]

So I shrunk my Windows 7 partition. Now I have a 450GB partition with Windows 7 on it and a 50GB partition for Ubuntu that is unallocated space currently. So when I go to the setup for Ubuntu, booted into using my USB flash drive, it doesn't recognise that Windows is there. It thinks that the hard drive, all 500GB of it, is free space. Going into GParted, it also seems to think that the entire hard drive is a blob of unallocated space. According to tutorials online, this shouldn't be happening. It should recognise the two different partitions. So I went into Computer in Ubuntu (Live) just to double-check and indeed all my Windows files are there and I can still boot into Windows just fine.

So what's the problem?

[Quackers]

Welcome to UF.
How did you shrink the Win 7 partition? Did you defragment it first? Did you reboot after to make sure Windows still boots? How many primary partitions are already in use on the Win 7 hard drive?