I've just re-partitioned my hard-drive using Disk Utility. I shrank my Mac OS X partition and created a new one with the available space. However, after rebooting, the option to start under Windows is now gone. I only have the option to start Mac OS X.
Basically, my partitions were like this:
After shrinking the Mac partition and creating a new one I get:
Does anybody know why the Windows partition was affected by this change? And how can I make it bootable again?