At this point I would run the System File Checker, but you said you tried that. Didi it complete with no errors found, or was it unable to correct problems found?
Issues following an infection always concern me, as it can be that either some of the infection remains, or damage the original infection caused has not been corrected.
If gadgets are important to you (I continue to use them, but they are a known security risk now), a Repair Install may be the fix. Repair Install