I reformatted my laptop, installed Avast, and only hours later, ran Avast Wi-Fi Inspector and got this warning of vulnerability to WANNACRY.. The recommended patch didn't work, then my computer started taking forever to do anything.. almost frozen.. The fan was going HARD and staying that way.. I noticed in Task Manager, that Avast Browser was running a bunch of processes.. So I uninstalled it, and installed every single Windows Update that I could.. Kept telling it to check for updates until there were no more.. Now the Wi-Fi Inspector Scan says that everything is secure and good! ...I believe the Windows Updates were what fixed it.!!