Win 10, Original Unos, USB 2.0 port.
I have a few Arduino Unos around with atmega serial converter chip. I had no problems programming them with the IDE. Then I needed to program some Nanos, so I installed CH340 drivers, and had no problem programming them at all. At the same time I noticed I couldn't program Unos anymore. Their COM port wouldn't show up at all, and the device manager shows Unknown USB device (device descriptor request failed, error 43). I have to be honest tho, it happened around a month ago and I didn't really need Unos at that time, was too busy, so I forgot about this problem for some time, but I'm pretty sure about my story. Anyway, it's suspicious that NONE of my unos work, and there is NO way I fried all of them, some of them just sat on the shelf when I decided to try them.
So clone CH340 converters work OK, original atmega converters don't work at all. Reinstalled IDE 3 times, to no avail. Could anyone drop a hint at what I should look at and how to fix broken drivers? I tried installing, uninstalling and updating drivers manually and automatically, but it just like its broken drivers and says they're the freshest broken version. Found a handful of driver manuals, none of them worked. Would appreciate any help, at the moment I have no choice but to program Uno with Nano as ISP, which is messy and long. Thank you!