Hard drive partition help

[GodlessAstronomer]

So I'm trying to install Linux on the same hard disk that has my Windows install. I need to create a new partition (the hard disk is not partitioned at this point at all).

The HDD is 160gb with 105 free. I right click My Computer -> Manage. In Disk Management I right click the disk, select Shrink Volume... and it tells me there is only 2,730MB available shrink space. I want to shrink back about 30gb. Any ideas why it only gives me 2.7gb space to shrink into? There is a note at the bottom of the dialog that says

Size of available shrink space can be restricted is snapshots or pagefiles are enabled on the volume

Any ideas? TIA.

 

[Elixer]

Why don't you use gparted? Most all distros use that to repartition the HD.

In either case, make sure you have a backup made first.