Given the problems you've had and that there is no data you need to keep I would do a clean install.
During the Windows 7 installation select new install rather than upgrade and on the disk partition page you will have options to delete partitions. Delete the partition and then recreate it - this will have the effect of formatting the disk.
You may install Windows 7 from DVD or if you can configure your laptop to boot off USB, Windows 7 will install from a USB stick (I think you'll need at least 3-4Gbytes for the USB stick to copy the Windows 7 files).
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by: LeeTutorPosted on 2009-10-17 at 06:18:00ID: 25595861
This page has a very good article on your various options:
m/win7/win 7_upgrade_ 03.asp
http://www.winsupersite.co
Upgrading from Windows Vista to Windows 7