If someone in your family or a friend asks you to look at their old win3.11/486/pentium 60/etc POS computer because it is "acting funny" run away as fast as you can! No good can ever come from working with that old crap...and it will suck your time away and you usually end up replacing enough to have built a new computer from the start.
If it is that old, I just say "that stuff is so old it ain't even worth looking at, and besides it was before MY time so I can't really be of help." If it ain't running win95 at the very least I know it is trouble...and since it is family/friend you know what you will get paid even if you do fix it -- JACK SQUAT.
Oh yeah, and if family/friends DO ask you to get parts for them...hide the receipt and just charge them more for it. You will thank yourself, and I consider it a justified fee for the "free" service!

It helps eliminate that "ripped off" feeling you sometimes get when working for people who don't consider your service valuable since they "know you." I haven't run into anyone like that but have heard horror stories on that subject.
Are you writing a book or something
qacwac?