I have somewhat the same problem as this guy has: Link Removed
I read that you guys might need the Diskmgmt information in his topic so here it is:
I had the RC which was dualbooting fine alongside XP. Then I got the RTM, burned it, booted up with it, deleted and formatted the partition on...
backup
bootloader
data access
data recovery
disk management
disk utilities
dual boot
easybcd
error message
file system
formatting
hard drive
lost data
os installation
partition
recoverytool
storage
system repair
windows 7
windows xp