This is annoying as hell. I get people expecting me to do it for free. I say no. I am payed for my time and assistance.
Before I even start the job I say it will cost, normally just charge between £20-£50 depends how long the job takes.
People just think I don't have a life, I work with IT in a college 8.30 till 4.30 and sometimes I come home and work from 5.30 till 1.00 and then have to be up at 7.30 for work again.
What I do now is say, I will fix it at a cost in my own time. What I hate is when people ring you up and they think they can ring you up anytime no matter what your doing and expect to drop everything to help them.
I was clubbing once in Newcastle and I got a phone call at 1AM to help get rid of a virus, told them to eff off and hung up (I was really drunk at the time).
I am 24 now, people who are between 14 and 18 who is reading this post and enjoy it as a hobby I gaurentee now if you ever have a full time job you will understand how hard and frustrating it gets when this happenes. Let this be a warning to you people.