Try shrinking again using free Partition Wizard bootable CD to "Resize."
Partition Wizard.URL
The tool I use if System files still refuse to budge after defragging, turning off page file, restore points, is Perfect Disk 10 trial version to Offline Defrag>Rightclick on C: drive>Select System Files.
Always back up files and/or a System Image when using a 3rd party partition manager as they can fail during resizing, although we haven't had one fail yet in helping hundreds of these operations here.