Hmm, after helping out some friends in the past I've found myself being invited round for what I think is a social thing only to get the dreaded "My PC is a bit slow" or "I got this message"...
The next issue can be is once you've touched someone's PC they consider you responsible for every single issue they get after that point.
I actually had one of my friends neighbours with a PC issue a while back, as I didn't know her and it was out of my way and, to be honest, I have far better things to do, I said I'll look at it for £50. I already had an idea what the issue was (a few hours to fix) but if I'm going to save her £100+ going to a shop and could fix it there and then it's fair. She decided against it and, to cut a long story short, ended up spending £300+ and not getting a proper fixgoing elsewhere.
I admit, while I'm happy to help my close friends or give what little advice I can on forums like this, I don't want to fall into the trap of spending most evenings fixing peoples stuff for free any more. I mean once one chap tried to haggle me down on price when I was offering my time for FREE and needed to order some parts! He wanted to pay me LESS than the parts cost me - I'd even shown him the site I'd order from so he knew exactly the cost! *sigh*
Cheers,
Scoob.