Please help! Invalid node structure and invalid record count

My MacBook Pro is about 6.5 years old. I upgraded to Snow Leopard 2 years ago and added RAM at the same time. My first problem ever occurred three days ago when my computer got super sluggish, I restarted and got the gray screen with apple and spinning wheel...no boot up. I ran disk utility from the snow leopard install disk and found "invalid node structure" and "invalid record count". After reading on here what to do...try to repair the disk and so on with no success I went out and bought Disk Warrior. Got home expecting to fix everything and Disc Warrior won't boot...I just get a file with a question mark and the disc is ejected. I tried erasing the hard drive but was only able to use the "don't erase data" option. Then I tried to reinstall Snow Leopard with no luck. Now I am stuck. Any ideas?

One thing to note is I am to the point of not caring about the files on the hard drive, I was a dummy and never backed them up...lesson learned! I just want my computer back without having to spend $1000+ for a new one. Then again I am always willing to do that too as a last resort.

PLEASE HELP!