Partition problems

i have a new pc, i tried to install XP MCE on it and it crashed. I had already set up the partitions. When I now try and install on it again I can only see the small C: partition that I created. I have no OS installed on this machine and I need to clean the drive and have the full 320GB available again.
I'm also having trouble cos when i try and install Vista Home Premium x86 i get to the point where it asks me where I wish to install and when I scan no drives (drivers?) can be found.

:( I need help with this guys. Please give me your best.:)

Now Lets You try To Make Your Hard Disk Partition With the Help Of DM-9(Disk Manager )
Step 1:- Boot Your Pc With 98-Bootable CD
step 2 :- Inset The Cd That contain DM-9 Software
step 3 :- Now Make New Partition
step 4 :- Format c:
step 5 :- Install Your Favorite Windows in c:

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