|You either have to set the bios to boot the cd first then the hard drive or you are not seeing the hit any key to boot cd or similiar message.|
You may also have an option during boot that by hitting a function key like f12 you will be presented with a boot menu. Choose the cd.
I am curious as to why your tech support isn't taking care of this for you? They should be installing anti bad guy stuff and configuring it for you also.