Editing registry before boot

[Nanaki]

Alright, I'm in deep s***. I installed a new computer and registered it. Now it asks to activate it -which I did after the install -I even called the **** hotline . When I press ok, it gives me a screen saying windows is already activated with one button; "ok". When I press that, it reboots. I can't even logon to my machine.

Now, after some research, I discovered it is one of the 'bugs' of the avtivation method and it can be resolved by editing something in the registry. Now, how can edit something before windows boots? Please, please, help me fast.

[oftentired]

How to recover from a corrupted registry that prevents Windows XP from starting

These instructions will work. But I think you'll lose the activation that was done. Would have to do it again. I suggest NOT activating until the installation has been completed.

I'm wondering if you can't just reinstall windows as the solution to this problem?

[Nanaki]

Thanks! Reinstalling would be a pain in the ***, that's why I'm using this method.