Operating System: Win XP 64-Bit-Edition RC2
Burning Software: Nero
Anti-virus Software: none
DAEMON Tools Version: none

Till Daemon Tools will support Win XP 64 you can use filedisk: http://www.insidewindows.info/ . No copy protection emulation, no support for all image types, command line interface, but it offers virtual cds.
This version: http://www.winimage.com/misc/filedisk_modbin64_tray.zip is better, it includes a tray icon tool to mount/unmount images easily. I noticed problems with some Alcohol and Nero images. For all images, that filedisk won't work with, you can use Winimage: http://www.winimage.com/download.htm (there is even a x64 version) to convert them to iso, which filedisk accepts.
That should be a good workaround for the next weeks until Daemon Tools 4 will be released.