Bleeping Computer today reported that the latest version of Windows Defender recently updated v.4.18.1908.7 will not perform a full scan. Bleeping Computer found that a “full” scan returned only 40 files. When I tried a full scan on my a test computer it scanned 25 files before it quit. You may not want to rely on Windows Defender full scan until this is fixed. The workaround is to run a “custom scan” and include as many folders as you wish. Borked! Gotta believe Microsoft will hop on this quickly. They have sure had a lot of buggy releases lately.