My Arduino IDE worked flawlessly on my HP laptop (Windows10 64bit) until I decided to move the sketchbook folder from C: to D: (laptop has 2 HD's). Now I get this message:
c:\users\John\appdata\local\arduino15\packages\arduino\tools\avr-gcc\4.9.2-atmel3.5.4-arduino2\bin../lib/gcc/avr/4.9.2/../../../../avr/bin/ar.exe: unable to rename 'core\core.a'; reason: File exists
Tried: 1. Resetting sketchbook location. 2. Uninstalling and re-installing IDE (rebooted Laptop inbetween). 3. Running arduino.exe as Administrator. No change. I'm pretty sure there are some leftovers in the system that somehow don't get erased by uninstalling and make the problem reappear.
Any help will be greatly appreciated.