Vista - Shrink Volume, Boot Partition - Available shrink space

I'm trying to shrink my C: Drive in Windows Vista, on my HP m9040n. I would
like to keep my personal files on another partition, so that if I had to use
HP's System Recovery I wouldn't lose all my files.

Under Computer Management, I select the C: Drive and Click 'Shrink Volume.'

Even though I have 175GB of free space, Vista tells me that I have 0 MB of
available shrink space.

I've search the internet and found how-to steps using g-parted, but they say
I must have a Windows Installation disk to repair the boot-up afterwards.
Since my HP didn't come with an actual installation disk, I'm not sure if I
want to try that.

Is there anyway I can shrink the volume?

Use Acronis® Disk Director Suite 10.0

http://eu.acronis.com/homecomputing/products/diskdirector/?source=eu_google&ad=partition&s_scid=partition%20software|947423394&gclid=CJutqozE0ZICFQ4kuwodDWX1Aw

System Recovery would return your PC to factory condition and delete your
files. Best practice is to store backups on a removable external hard drive.
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"kdagostino" <kdagostino@xxxxxx> wrote in message
news:6EDDD8FB-5536-4DE5-8B46-A4C837B2D085@xxxxxx