Thank you very much,everyone.What do you think about Ledger and Bitlox?
Why not check this review by Voskcoin here
https://bitcointalk.org/index.php?topic=5288629.0Or check this big list of hardware wallets with reviews here
https://bitcointalk.org/index.php?topic=5282364.0Electrum installed the latest version from the official site,Windows 10 OS
Only mazilla and wallet are installed on it,no other files in the system
It's good to be back in the hangout again

Be careful there is no mazilla it might be malware or are you talking about the Mozilla browser?
Like I said you should have installed Antivirus without them there is a big possibility if you connect your PC to the internet and access some unknown site that could access your PC or inject some viruses your Electrum is not safe. It's always recommended to use Antivirus that supports Crypto and Bitcoin.