Have a Uno R3, using Dell Inspiron 9400 laptop with win 8 64 bit.
Deleted Arduino folder, updated driver, updated Java.
Do not have process directions said to stop..
Checked Device Manager, nothing else seems to be using a COM port but the Uno.
Can't seem to disable Bluetooth, no switch for it, just wireless.
Program freezes for several minutes when I access TOOLS or SKETCH menu, and then returns to normal after a while.
Was able to upload blink program no problem.