Reinstalling Trados after PC formatting

Hello,

I'm about to format my PC because it's not been operating right and it's probably going to crash any day now.

I've got SDL Trados Studio 2011 (freelance plus license) installed, and my question is this:

What do I need to do before the formatting? Deactivate my license? I've written down my activation code. Do I need to do anything else?

Also, since it's been years since I installed Trados in the first place, can someone please help me - or provide a link - with the steps needed to reinstall Trados after the formatting?

Any help is welcome. Thank you.