I'm using my MeLabs U2 USB programmer just fine.
Have you seen these?
https://answers.microsoft.com/en-us/...6-680bebb6894d
https://answers.microsoft.com/en-us/...4-8328f438315c
It might not be a MeLabs problem, but a windows problem.
EDIT: yeah, there's a bunch of stuff for those errors:
https://answers.microsoft.com/en-us/...f-64855962ad71
Bookmarks