A lot of us on here likely use Electrum as our go-to desktop wallet. And, it does the job pretty well for bitcoin. but maybe you're after some other features Electrum doesn't have, like being able to hold altcoins too. and If that's you, then Electrum just wont cut it anymore and you gotta scout out another option instead.
The subject of the thread actually shows that the OP is only interested in bitcoin only wallet as he stated if there but if he is actually considering the Altcoins then there is the unstoppable wallet I think.
If you are not willing to change the OS you use to something safer like Linux, and it seems you do not as you specified that you wanted a wallet that works with Windows, then you need to get a hardware wallet, hardware wallets are ideal for someone like you that is using an insecure OS like Windows but still want to secure their coins to the best of their abilities, with Ledger and Trezor being the two most popular options in the market of hardware wallets.
Yes the windows is actually not a great OS for bitcoin wallets but even with Linux I don’t think the OP is secure as long as it is an online wallet. For maximum security the hardware should be the best option for OP because even airgap wallet set up needs it knowledge and if the OP isn’t that knowledgeable in that regards, the set up might have some flaws.