I am using MS Office Professional Plus 2010. I want to completely remove it. Now you may be asking yourself why I'm not doing it through the control panel. The reason is because last time I did this it failed or something and I ended up with a corrupt/corrupted file(s) and every time I booted up I had a message I had to click away. If you need any further information please ask.
If you want to be entirely sure, try the free Revo Uninstaller. It combs through the registry and hard drive after the app's built-in uninstall has finished and allows you delete any left-over files and registry entries. I've noticed that about half of programs leave crap behind after being uninstalled.
The "Pro" version does 64-bit software, the free version only handles 32-bit software, which is the vast majority of what we use.