SpyBot - Search & Destroy
Freeware, ⌐'2000-2002 Patrick Michael Kolla

SpyBot - Search & Destroy searches your hard disk for different kinds of internet threats - including spy- and adware, key loggers and your usage tracks (for example your browsers page history). Spybot-S&D can also fix some system problems.

Spybot-S&D also offers some tools, like the Secure Shredder.

License
Why freeware? There's a simple answer to that. What do you get if you buy a program? Lots of ones and zeros, that's all. If they were distributed as art, I could understand to pay for it.
But if the main goal of their order is to earn money - by fees or ads - I don't like it!
And that's why this program comes for free. But if you like it and it helped you, I ask you of one thing: say a prayer for me to your god - or whatever you believe in - and wish me some luck.

Needed Soft- and Hardware
You obviously need some sort of 32bit Windows, like Windows 95, 98, ME, NT, 2000 or XP. About 2 Megabytes of free hard disk space are also needed.

Usage
Start the program by double-clicking the file SpybotSD.exe in the directory you extracted the archive. If this is your first use of Spybot-Search&Destroy, you will be asked whether to create a desktop icon and/or a start menu item.

After that, you are inside the program!

If you need more information, read on about scanning.