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Did you remove both the linux and dos options for the PXE menu? That usually works, but maybe this bios likes to be more difficult than most.
I don't see an updated Bios for the T500, but I do see some older ones. You could downgrade your BIOS for now until there's an updated BIOS that works.
Thanks platero. Yes, I've reduced our PXE Menu by removing both the DOS and Linux boot options. I think that I'll try your suggestion of downgrading the BIOS for now. I'll also send a note to our Lenovo rep so that they will be aware of the problem.
Since posting this question I've noticed that there's quite an extensive thread on this topic with lots of information. (Several threads actually.) So rather than continue a separate thread I'm going to suggest that anyone having this problem should take a look at http://community.landesk.com/support/message/38820#38820 .
Also, if you're having this problem with Lenovo machines on BIOS version 3.11 or newer I think you should contact Lenovo and let them know that their BIOS needs to be fixed.