i'm formatting all my PC , will delete everything on it and start fresh with Electrum.
If you don't have any protection in your PC you can be hacked that's why you must have a working antivirus to make your PC safe.
Don't use free AV like avast because it will only give you lots of malware and viruses. I suggest you try the Kaspersky internet security or total security trial as free to protect your PC to any malware and viruses.
Blockchain wallet is not recommended right now there are many people are being scammed and hacked that's why we don't recommend using it while block halving is coming.
Electrum is a great wallet if you know how to protect the wallet. Make sure you have Antivirus like Kaspersky to protect your PC.
Or you can keep your PC/Electrum offline.