Description of problem:

My system is setup as follows: 
* Asus P5Q Deluxe motherboard
* (/dev/sdb) Two drives in RAID-0 (via Intel Storage Manager) as C:\ for Windows Vista
* (/dev/sdc) Hard drive formatted NTFS for Windows Vista
* (/dev/sdd) Hard drive that I want to install Fedora 10 x86_64 on

The installation procedure works fine until after I setup and format the partitions. Anaconda crashes when trying to change where the bootloader installs to from /dev/sdb to /dev/sdd. 

Identical tracebacks were posted for anaconda in bug #465467 for Fedora 9 and in bug #467203 for Fedora 10 (but not by the original submitter). 

How reproducible:
Every time

Steps to Reproduce:
1. Boot with installation DVD
2. Go through the installation procedure and format and partition the disk
3. On the booatloader screen, click on the option to change where the bootloader will install
  
Actual results:
An exception is thrown and anaconda crashes. A debug dialog is popped up.

Expected results:
Should be able to change bootloader from /dev/sdb to /dev/sdd

Additional info:
A friend with a very similar setup (ASUS P4Q motherboard and identical drive configuration) had the same problem with the Fedora 10 x86_64 DVD.

After restarting the installer many times it suddenly decided to work and anaconda changed where the bootloader was setup and proceeded with the installation. However, upon reboot, his system could not load GRUB from the Fedora drive. The Vista installation on the RAID would not load either.