I understand that you found some suggestions about registry edition - they are not so bad. If you don't want to download any files which allow you to disable CAPS LOCK, you can create it by your own:

1. Press WinKey+R > type notepad and press Enter
2. Paste to the notepad this:
   

   Windows Registry Editor Version 5.00
   
   [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
   "Scancode Map"=hex:00,00,00,00,00,00,00,00,02,00,00,00,00,00,3a,00,00,00,00,00

3. File > Save As...
   
   • Select for Save as type: All Files
   • Enter in the File name field: disable_caps_lock.reg
   • Click Save
4. Right click on the created file > Merge
5. Restart your system

In the case that you want to enable CAPS LOCK again, you need to delete that registry entry, so you need follow these steps:

1. Press WinKey+R > type regedit and press Enter
2. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout
3. Right click on the Scancode Map > Delete
4. Restart your system

I guess it might be the only way to disable CAPS LOCK.

In the case that you still don't want to do that, Windows 7 is offering something different than disabling CAPS LOCK. You can enable Toggle Keys, so you are going to hear a tone when you press CAPS LOCK. To do this follow these steps:

1. Press Start > Control Panel > Easy of Access   > Easy of Access Center > Make the keyboard easier to use
2. Mark the Turn on Toggle Keys checkbox