Windows 7: How to upgrade to Win 7 Home Premium without Vista

I had a fully activated and legal copy of Windows Vista running on my computer 3 months ago. I formatted my disk to install Windows 7, thinking I will activate with the upgrade key I bought.

How do I upgrade now?
Please tell me there is way to do it from within Windows 7. I have installed all the programs I want and have it running exactly the way I want it.

Don't tell me I need to clean install Win 7 again?

What version of Windows 7 did you install?

If it's the RC then you can do a clean install with the upgrade version. It has to be activated first.

This will be confirmed soon when people will probably try every variation and post what can be done.

I had Windows Vista Home Premium (OEM) on my notebook.
I formatted my C:
Installed Win 7 Home Premium Upgrade

Activated with Win 7 Upgrade Key.
It activated and fully works now!!!!!!!!!

No need to reinstall with Windows Vista HP and upgrade.
Completely speculating, but it may be because I have an OEM partition before my C: with the Windows Vista setup files.