If you get an external enclosure like this:
Attention: package contains an extra foam sticker for 7 mm thickness hard drives, you should attach the sticker to the original one inside the lid before you insert the hard drive; 12.5 mm hard drives might be incompatible with this product. 70% faster than traditional USB 3.0 With UASP transfer ...
www.amazon.com
...it may be possible to erase the old HDD and re-purpose it.
BUT...
Have you tried MalwareBytes yet?
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Malwarebytes official site: all-in-one cybersecurity software for all your devices. We provide antivirus, anti-malware, VPN and scam detection for PCs, Macs and mobile devises. Powerful digital protection, always by your side.
www.malwarebytes.com
IMPORTANT:
Select the "home" option.
It's a FREE download
IMPORTANT:
You DO NOT NEED TO BUY A SUBSCRIPTION to run MalwareBytes.
It will run FOREVER IN FREE MODE.
When you open it, IGNORE the button to "Upgrade Now" or "Activate License".
Just click "Scan".
Again, you DO NOT have to buy the pay-for version!
You CAN pay to register it if you wish. The cost is very reasonable.
Do this, and it will offer malware scanning/protection "in real time", continuously.
The free version only runs when you launch it manually.