So here I am relaxing and enjoying my day at work(LIES) when this russian lady comes in. I help run a computer repair shop and had worked on her laptop 5-6 months back when her windows desktop was taken out by a virus. Back then we spent a week or two researching and working to find a way to restore the machine, but in the end we ended up having to reformat it since that was the fastest method to getting her computer back to her. It had a ton of viruses and no way to restore to an earlier date. We tried every fix out there with no luck.
We ghosted all her data to another drive first so she wouldn't lose anything important during the format and backing-up process. After the machine was finished we went over the data with her and made sure that she got what she wanted. She wasted a lot of our time complaining and making us install various russian language programs back on the machine. We only charged her a measily two hours($130) worth of work to be nice.
So she came back this morning after so many months and explained that the same thing happened again(her desktop completely disappeared), but this time she managed to fix it herself through some online research. She didn't know if it was the same problem(same virus,etc) but demanded that we give her her money back and stated that she was more experienced than our own technicians. She continued to ramble and verbally attack me for about 10 minutes stating that we were incompetent before I sent her away and asked for her to contact and speak to a manager about the matter. I've never seen such a fruitcase...much less been attacked by one. I just maintained my composure and tried to cool her off so she would leave.

Am I the bad guy in this scenario? I couldn't fix her problem last time but got permission to work around it with a backup/reinstall. I don't believe her recently issues were the same ones that she had when she was here last.
I'd like to help people like this, but there's not much you can do when they won't cooperate with you.
KG