How can I disable or reassign the 'Windows' key?

See my answer for Reassigning the caps lock key on Windows or OS X:

You can use SharpKeys to disable the functionality of any key. For a detailed guide, you can check out Map Any Key to Any Key on Windows XP / Vista.

You can add a certain value to the Registry to disable it. Here is a good tutorial, and some .reg files you can download.

However, this will disable the key entirely, as in no WinKey shortcuts. However, what I do is that I disable only the left Windows key, and use the right one to enter shortcuts. It's a sacrifice, but it means that I don't minimize anything fullscreen by accident.

You can download SharpKeys! It saved my life, especially when I want to press ESC and accidentally press F1.

SharpKeys is free. You can download it from here

• When installed, click on Add button,
• on Map this key (from key) section click on Type key button. Type F1.
• on the To this key (to key) section, select Turn Key off item.

Confirm with OK, reboot your Windows (because registry got changed). You're done!