Start-up Grey Screen Shows Apple Sign, Prohibited Sign (Mostly), Folder w/Question Mark

Ok, I need help!
When I start my mac up it automatically goes to a grey screen and shows a rapidly flashing apple sign, prohibited sign, and every couple of seconds a folder sign with a question mark.
I just deleted alot of stuff off of my computer and I think I probably deleted something that I shouldn't have, which is probably causing this problem.
I have the operating system of the snow leopard X, but I dont have any type of utility discs to the mac to reinstall the program if thats what I even need to do? I am not sure?
I have checked the drive already and it shows that I have one. Machintosh with an arrow sign point up.  When you click the sign it goes back to the grey screen again.
And I did the command, option, p, and r thing to reset the pram and nvram, and again it just takes me to the grey screen again.
I dont know what to do...please help me. I just need the computer to work again. I dont really care about any of the files on the computer!

Thsi usually means it can't start from the volume, You will need the install disk to try to run the disk utilities to repair the disk if possible, or reinstall the OSX.
If you do not have the install disks(s) that came with the machine you may be able to get them from Apple for a small fee.Try calling Customer Support
800-767-2275
It may also have a hardware failure.
You can bring in to the Apple store and they will diagnose it for free and give your options.

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