You can have a password on the Firmware or the OS, you have one on the firmware, good, but your disk is security guarded (probably encrypted), and then you can not install an OS without doing something special: it would be too easy when any could overwrite a security guarded disk.
I do not know how to do it, you better ask your IT manager.
When I started the downloaded Lion file, it asked me "What hard drive do you want to install Lion on?". There is only one drive, but I cannot select it, (it was greyed out) because of his disk cannot be used to start up your computer". I did the exact same on my desktop machine with no problem. Thanks
If you have a spare USB flash drive around you can make a copy of the Lion install on your desktop machine and use it to boot your MacBook Air. See the article here.
Hope this will help,
Oh, you can also install on your drive from the flash drive, too.
Message was edited by: clintonfrombirmingham