The i/o on an SD card is pretty slow. You have two possible problems. Either the SD card is going bad, or the installation is broken.
I would suggest that you do a full clean reinstall of your android SDK by removing everything and letting the sdk do a fresh install. Referring to this link shows you how to do a reinstall on Windows 10.
To Completely Remove Android Studio from Windows:
Step 1: Run the Android Studio uninstaller
The first step is to run the uninstaller. Open the Control Panel
and under Programs, select Uninstall a Program. After that,
click on "Android Studio" and press Uninstall. If you have
multiple versions, uninstall them as well.
Step 2: Remove the Android Studio files
To delete any remains of Android Studio setting files, in File
Explorer, go to your user folder (%USERPROFILE%
), and delete
.android
, .AndroidStudio
and any analogous directories with
versions on the end, i.e. .AndroidStudio1.2
, as well as .gradle
and .m2
if they exist.
Then go to %APPDATA%
and delete the JetBrains
directory.
Finally, go to C:\Program Files
and delete the Android
directory.
Step 3: Remove SDK
To delete any remains of the SDK, go to %LOCALAPPDATA%
and delete
the Android
directory.
Step 4: Delete Android Studio projects
Android Studio creates projects in a folder
%USERPROFILE%\AndroidStudioProjects
, which you may want to delete.
From Ironman