In Windows 10 I had that problem because My C Drive was getting full and I had needed free Space, AVD folder had 14 gig space so I needed move that folder to another driver,first answer not work for Me so I tested another way to fix this problem, I make a picture for you if you have the same problem, you dont need to move all of files in .android folder to another drive (this way not work) just move avd folders in ....android\avd to another drive and open .ini files and change avd folder path from that file to new path. Like this image:
I Hope this works for you.