At that page you can unlock any Google Apps or Google Account CAPTCHA, just use the full email address and password (make sure the password is correct!)

chflags nohidden ~/Library

Push return and your Library folder will return once more!

*edit* post corrected “no hidden” to “nohidden”, no thanks to Lion’s new autocorrect feature!

To remove the program follow these instructions :

1. Open Applications folder > Utilities > Activity Monitor, then make sure the drop-down menu at the top right of the window is set to “all processes.”
2. Use the search field in Activity Monitor to search for MacProtector or MacDefender.
3. Click on the MacProtector/MacDefender process. Click the “Quit Process” button. Click “Force Quit.”
4. Drag the MacProtector program (installed in the Applications folder by default) to the Trash. Empty the Trash.
5. Remove MacProtecter from the Login Items for your Account in the OS X System Preferences (if it exists).

Prevention :

To prevent such programs gaining access to your system:

• Uncheck the “Open safe files after downloading” option in Safari preferences
• Be careful with where you type your password
• Never believe anything you haven’t installed claiming to have found viruses on your computer (this applies to Mac and PC), especially on a website.

To set LibreOffice as the default application to open a .wps file, select a .wps file, go to the File menu > Get Info > Expand the ‘Open With’ section > select LibreOffice and click on ‘Change All’