Spybot S&D, what a great program, but if used inappropriately you can really kill your computer. In the event you're running TeaTimer you can do some damage.

What do I mean? So if a process occurs and Spybot asks you if it's OK, and you say "No!". Wait! I didn't mean to say that and now I've disabled internet access... well you could roll back your settings via the program itself. What if by some freak accident you unistalled Spybot without rolling back your decision? Game Over! No, not really!

The easiest way to fix the damage that Spybot has done, you can simply create a new account:
Start > Control Panel > User Accounts

Then you could delete your old account. Make sure to transfer your files before doing so via a public folder or a USB key.

You're good again!

Now, this is just an easy non-technical way to do this. There are many other ways, but by far this is the easiest way.

Spybot S&D:
http://download.cnet.com/Spybot-Search-amp-Destroy/3000-8022_4-10122137.html?tag=mncol