Firmware Upgrade causes machine failure

[gash2]

The computer came up with a message from HP saying that a firmware update was necessary. There was no choice to not do the update and the computer proceeded to restart and do the update on its own, I did not order this update, I didnt want it and I did not do it myself. After the update I started getting all sorts of faults and crashing with BSOD. The computer was flickering, pausing and crashing. It said it was something to do with a faulty video driver but couldnt find any faulty drivers. After trying several work arounds, uninstalling the video card, windows updates, troubleshooting through windows and HP  assistant and even a reset of the PC to no avail I called support. I was told I had to do a wipe of all files and windows using safe reset and a complete re-install. After performing this the computer was still having the same issues. I called back to support and was told that this method wasnt good enough I had to do it again but had to do an image onto a USB stick and then re-install from there rather than through the internet. I balked at this and complained, it not only performs the same function but now I had to go out and buy a USB stick at my cost. But was told no I had to do it, I refused and elevated the request to a repair. Now I am told that I will be without a computer for 2-3 weeks while the repiar is performed. I use this computer for my business and have spent 2 full days trying to repair a machine that HP made faulty. I didnt do this update, the computer did it automatically and no-one has been able to tell me how to fix it. I bill out at $250/hour so I so far have more money in this computer than its worth, as far as I am concerned you can take it back, give me a refund and I will go buy a competitors. I thought I was buying a computer that worked, I paid good money for it and I bought it because HP has always worked for me in the past.