hard drive not letting me partition

hey all.

i have windows vista ultimate.

so today i was going to install ubuntu on my computer.

so i went to computer management, and right-clicked my C: drive, went to the 'shrink volume' option and..... it wouldnt let me shrink it! i only have one other partition, and its a small 7.04GB partition used for my backups. i cant make anymore partitions off of my C: drive anymore, so i tried making one off of my backup partition and it let me do it!! what the fuck? is this microcock trying to rip me off?

Fucking idiots.

Do NOT try to shrink the partition from gParted or your install disk.  If Vista isn't resized by itself, it will crap out and you will need to reinstall.  Windoze is gay like that.

tl;dr: Find a way to do it in Windoze if you don't want problems