To completely start over, search for a tool called "delpart". This tool will delete any and all partitions on a hard drive. Then boot form the CD (you may need to edit your CMOS for this) to launch the install process.
If you can't boot from the CD, use another system to build the boot floppies.
Dig Deeper on 64-bit Architecture for Windows
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.