This morning I took my son up to the top of the drive way and my car was doing fine. I had turned the car off once he got on the bus I went to start my 93 Pontiac Bonneville and it didn't start and the security light is staying on. I'm not sure if I need to replace a main fuse under the hood or if its something worse than that. Anyone know what might be the cause of this problem?

Not sure what you mean by security light. Is it one of the interior lights that normally come on when the doors are opened? In some cases there are slide switches that allow you to turn the light on manually or move it to auto operation. Is the switch set for auto operation? Until you are able to find the problem, can you remove the bulb to prevent the drain on the battery?
And most importantly, make certain that you have a good battery by having it tested and good clean connections to the battery also.

Your car not starting can happen if the system thinks someone was trying to break in, I think you may need to have your codes reset. I forget what my boyfriend did when that happened to a customers car last month.