Are you having an issue other than just being slow?
I can't recommend any since I haven't used them. I typically have my data on an external drive somewhere and just wipe the computer and reload it from time to time (every couple of years if it lasts that long).
If you're having malware issues, I typically use malwarebytes.org software (free version) and it does a good job of getting the pop-ups and stuff that you sometimes dont' know is running off the computer.
To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault