Welcome to Seven Forums.
It's not really clear what you have done so far.
Read through this Seven Forums tutorial:
(Click here=>) Clean Installation with Windows 7
In step #7 click on 'Drive Options (advanced)' you should see the HD in this step.
Continue as per the tutorial. Make the partitions as you would like them and format.
If you can't see the HD in step 7 above, tell us what you see there.
Give us a step by step of what you have done to that point.
With details we can help get this issue solved.