Message to the computer users of the world:

Get / keep a copy of your operating system and the programs you have installed - will ya?

I'm losing count of the number of times a client wants me to fix Windows or Office or whatever but they don't actually have the disc. "Oh, a friend installed that for me, I don't actually own the software." Oh - and make sure you lose that license key thingy too. No need to hang onto that.....

But I'm not bitter.........