Replace Vista with Windows 7 - Install Options

[Nurturing]

I had a Windows Vista based Lenovo desktop since past 2 years. Yesterday I bought a Windows 7 Upgrade DVD and tried to install. While doing this one problem I faced is I was either able to format the entire hard drive or only the C drive where Vista is already installed. Whereas I wanted to format the C drive and repartition it and then install windows 7 on new C drive. but surprisingly there was no such option. The only thing I was able to do was either installing Win7 on top of Vista or reformat the C drive and install Win7 on the Partition where Vista was installed.

Any idea why is that so?

[LeSueur]

The reason behind that is Windows 7 can be installed on empty drive because it requires 100MB system partition for boot files and partition and format the remaining space for the system, programs and data. So what you can do is while installing the same, simply select advanced drive options and delete the original system partition. Now select the empty space and continue the installation.