Vista - Clean Re-install Vista Problem on Dell Laptop

Computer == Dell Inspiron 1520
System DVD == Window Vista Home Edition (distribute by Dell)

I need wipe off entire C drive and perform a clean install Vista over current installed Vista.

Here is the steps I went through and had problem finally:

1. I boot up with Vista Home Edition DVD;

2. Get on "Install Now" window, and click the "Install Now" get into next step;

3. The update option is disabled (which is good because I need clean install), I click the advanced option, the next window only show couple partitions without showing C drive!!!

4. After all the tries to load drive, refresh drive, etc. The C drive never show up!!

How can I get clean re-install over exist vista system??

Thanks in advance.

how many physical hard drives do you have?

Just One physical hard drive, but has been partition as Drive C and Drive D.

Thanks.

if you add together all the partitions sizes, is it equal to the actual size of your hard drive? if so, your "C:" drive may just have been assigned a different letter. if you are looking to completely start from scratch, and arent trying to save any data, you can delete all partitions and format the drive, which will erase everything.

Thank you so much and I kind figured out.