Error message

Starting up UNO 3 board attached by USB to desktop, getting error message - Invalid library found in C:....... trying to download Burn Bootloader - any suggestions?

Invalid library found in C

Is it halting on this error. I get that on every compile because I have a lot of old libraries to support legacy code.

The error message will tell you what libraries it doesn't like so why not move them into another folder.

Only just learning Arduino, so not that many files, will check out the suggestion though, will advise result thanks for the info.

Only just learning Arduino, .............. trying to download Burn Bootloader

You do have a programmer of some sort do do this don't you?