What version of the content are you installing and what version of Bladelogic are you using? (service packs)
BL 8.0 SP5 patch 1 on the appserver and Compliance Content SP6
You’re running the install as a member of BLAdmins? Can you look in the Property Dictionary, under the custom classes and in the audit trail, see if you see any denies?
Also look in the TEMP (wherever that is on your os) content_install log file and see if there are more useful errors.