Personally, I wouldn’t turn my computer on for a minute without a high-quality antivirus software installed. Fortunately, there are a few really useful online cybersecurity tools, plus a few one-time downloads that can actually help you clean up your computer.
I hate to tell you this, but there are almost zero online virus scanners. Most of them are just trial versions of paid software, a lot of them don’t really do anything, and some of them are phishing sites trying to steal your data or convince you to download malware.