I bought mine from San Gwann on Thursday
I wonder if you have tried a different USB socket, it worked for mme when I had the same trouble.But my troubles are far from over, other than the actual letter keys, most dont correspond with the actual letters and signs on the keys. For example if I press the question mark key I get this- or upper case I get this_.
I have tried reinstalling the software but with no luck. I will probably take it back to Lidl and get my money back.
PS if you eventually get your PC to recognise the keyboard will you please let me know if it behaves the same as mine.
Thanks Bob, Bugibba