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From the M-Audio User Forums:
Fast Track Pro conflicts with Internet Explorer 9 RC on Win 7 64

Preliminary testing with the Release Candidate for Internet Explorer 9 has found that on Windows 7 64-bit, ASIO on Fast Track Pro breaks and causes applications such as Ableton Live 8 and Pro Tools not to open. WDM continues to work, so Windows audio will function, however ASIO enabled applications will freeze on launch. We will update this post with more information as it becomes available.

At this point no issues have been found with other M-Audio USB and FireWire devices.