I should think you are happy after that result. Even as a Chelsea fan i enjoyed watching that.
When you insert your Vista disc to reinstall, the onscreen instructions are quite easy to follow.
I believe you have to choose to delete your hard drive contents before it allows you to procede. It did with me, although Vista wasn't on a seperate partition on my PC, so if Vista's on a seperate partition on your PC you may be able to do that.
Personally, i would wipe the lot every time.
These instructions come from Microsoft support.
Turn on your computer and insert the Windows Vista DVD or CD.
On the Install Windows page, follow any instructions that might appear, and then click Install now.
On the Get important updates for installation page, we recommend getting the latest updates to help ensure a successful installation and to help protect your computer against security threats. You will need an Internet connection to get installation updates.
On the Type your product key for activation page, we strongly recommend that you type your 25-character product key to help avoid problems during activation.
On the Please read the license terms page, if you accept the license terms, click I accept the license terms.
Follow the instructions on each page. On the Which type of installation do you want? page, click Custom.
On the Where do you want to install Windows? page, select the partition where you want to install Windows.
Click Next to begin the installation. You might see a compatibility report.
Follow the instructions.