what you suggest me to do, to protect my account?
Basically: Don't store your coins (at least the majority which you can't afford to lose) on a device which is connected to the internet in any way.
The best combination of security and convenience is a hardware wallet. These store your coins in an isolated offline environment which can be accessed by infected computers without losing your coins since you have to verify each transaction on the hardware wallet itself.
If you don't want to spend ~70$+, your best bet for storing higher amounts would be either (1) an offline computer or (2) a paper wallet.
Both are very inconvenient to use, but offer very high security (even better than hardware wallets since you basically don't have 'any' attack surface).
It all depends on your personal needs.
If you don't want a hardware wallet and don't want to have the inconvenience of pure offline storage, i'd suggest you install linux on your machine (besides windows) and install a wallet there (e.g. electrum). Then only use this OS to access your wallet when needed.
Also protect this wallet with a password.
Most malware is written for windows, android and iOS. With anything else, you are 'pretty good to go'. At least for amounts less than a few thousand dollars.
Anything above, should be secured pretty consciously.