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#51
Very easy to clean off the hard disk.
When you boot from your USB stick,
at the very first dialog that appears:
Use SHIFT+F10 keycombo.
This will put you at a command prompt that will say X:>
The Win 7 install routine has created a disk in ram and given it the letter X:
Now you are going to use diskpart once again and perform a CLEAN but not a CLEAN ALL.
The CLEAN will write zeros over the area where the partition table would have been and also where boot info would have been. End result is the disk is for all practical purposes a virgin disk.
Here are the commands:
DISKPART
LIST DISK
SELECT DISK 0 (assuming that's your hard disk)
DETAIL DISK (just to make 100% you got the correct disk)
CLEAN (to wipe out the first 64 sectors)
EXIT (to exit diskpart)
EXIT (to exit the command shell)
Now you can continue with the install.