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most likely the virus installed a pre-boot root kit and has messed up the MBR etc.
I would boot off a EETech CD, copy the users data off somewhere safe (and quarentiened so you don't affect anything else!), then you can try to decrypt the machine.
It may well work in EETech, as the virus won't be running, but you may have to do a forced decrypt unfortunately if the disk information is truly messed up.
If it's an important machine, of course call your support team and get them to assist.
Sounds good. Thanks for the quick response! I hope this will help clear things up...