I was in the setup area of my Optiplex GX1 450 mtbr computer... I went down to the Drive 1 section and I had accidently pressed the arrow keys. I didnt notice this at first, until I tryed to reboot the system. Then I realized I would get an error. So, I go back to the setup screen and I cant remember what the setting was. Therefore I cannot use my computer... Is there a way to recall default settings? My computer was used and didnt come with any information reguarding the hard drive. Here is some system information from the system screen. Hope this helps.

Intel Pentium Processer III
Level 2 Cache = 512 Integrated
128 SDRAM
8 MG SGRAM

My drive 0 is set on, 25: 1024, 9, -1, 1024, 17, 80 if I'm not mistaken.
I am a complete computer novice (Stil cant use the microwave). I just got a computer a few days ago.
If you need more information for you to help, please ask, as I want to know how to fix this...