Hello ! 8)
After updating my arduino software to arduino 1.6.13 my computer can't see arduino boards! I tried to connect Mega2560 and Uno rev3, but nothing. My computer can't see arduino boards and arduino software too.
I have windows 7 ultimate 64 bit.
Why? Any help?
What version did you have before? I don't think the drivers have changed recently, so the upgrade shouldn't break anything.
What is device manager showing?
Are they official boards or CH340G-based clones? If the latter, do you have the CH340G driver installed?
I have 1.6. 8 -10 version. I don't remeber !
Yes, I have a CH340G-based clones! 
I instaled driver for CH3400 and now all is good ! Thank you ! 8)
But for previous versions it's works with out driver ! 
But now it's allright ! 8) Than you again !
The mystery is not why you needed to install driver now. The mystery is how it ever worked before!
DrAzzy:
The mystery is not why you needed to install driver now. The mystery is how it ever worked before!
Yes. It worked before wery well so I forget about the drivers! 