Steps to do this:

1) Hit WIN+R or search

2) Enter "Regedit.exe" and hit enter

3) Go to where I am in the picture (HKEY_CURRENT_USER>Control Panel>Desktop)

4) Right click on desktop and select new DWORD

5) Call it "JPEGImportQuality"

6) Set it to 100 (decimal - not hex)

7) Close regedit