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I don't use Windows Defender for that reason. There is an excellent piece of free software developed and run by some geeks in USA university. I run it once a month. It loads updates to fight any new spyware / malware that appears on the net and takes about 30 minutes to do a scan. It finds and eradicates stuff that Defender and other anti virus software misses. It's called Spybot Search and Destroy you can get a paid for download with all the bells and whistles but I find the free download is good enough, you can send them a donation if you want Good Luck
Its hard to soar like an eagle when you work with turkeys
Although Windows Defender is better than it was a few years ago, I wouldn't trust it to protect my computer. If you want a free one you could try AVG Antivirus or Avast, both very popular. Personally I use Trend Micro Maximum Security with a 5-user licence. Another popular paid one is Kaspersky.