The most frustrating? Everything!
I use to help out family with pc problems.
I use to...
But then, all I would offer to do is restore the pc back to factory.
I told them that they would lose anything and everything not backup up.
That was their responsibility. Restoring to factory was mine.
After I finished the restore, I also re-applied all the windows updates, which could take hours to do in itself as so many others know only too well.
Then, that wonder day arrived out of nowhere.
It hit me like a brick.
I went out and bought (actually ordered) my very first iMac.
After exploring my new system, I suddenly realized that a commuter could actually be something of pure pleasure to use.
For once having obtained that peace and normalcy in my computing life.
Naturally, I began to refuse to work on other computers, regardless of kin or friendship.
Now I simply recommend to that desperately helpless soul that they commit the funds and buy a mac, or run over to wally world and grab one of those $498 windows based system.
Sadly, they usually ran off to wally world.
I' have had my current and very first iMac for nearly 5 years now and never once had to open the hood or restore one single thing.
So the first rule of thumb when ever considering working on other computers would be convincing that person to buy a mac.
If that doesn't work, wally world.
Its amazing.
I was house cleaning just a month ago and came across an old windows 7 system that I built for video editing. Asrock motherboard, 1080p graphics card supporting two simultaneous monitors, two 500GB hard drives, 8 GB memory, WiFi card, two BR dvd drives, all within a then very pricy media PC case.
So... I decided to get rid of the animal by clean-restoring windows 7, loading some basic software, and selling the beast.
I posted this contraption under the online classifieds at work, even included an Acer 21" monitor, all for $200.
No takers.
Seems now that everyone prefers sticking with tablets or phones. Few desire desktops.
But finally one lady, just one, and all it takes is just one, inquired wanting to replace her old HP.
So thru fate I am now finally and totally windows-based pc free.
And it feels wonderful !!!
But what the amazing part was, that when restoring the box back to clean installed win7, I was amazed how much I had forgotten about messing with windows based systems within just the past 5 years.
All the little tricks, short cuts and time saver tips, all forgotten.
And as I went thru the dreadful process of restoring this pain-in-the-rear-end machine, I also recalled all that frustration I once had to endure when working not only on other computers, but on my own computer(s).
Never again. Never a-gain!
So as Nancy Reagan might say, "just say no" when anyone wants the family pc guy, meaning YOU, to screw around with their screwed up pc.
Sure, you might become known as that uncooperative A-hole in the family for refusing to once again endure that world of pc hell, but so be it.
"Oh... he knows how to fix it, he just won't. And after all I did for him", is what they will say.
And your response? F-U lady

I got my life back. You do the same.
Don't be such a F-ing tightwad and go out and f-ing buy a f-ing damn mac.
Mommy.....? Dearest...? Giver of life...?