Under Windows, my experience tells that the stronger the security/antivirus system on your PC is, the more difficult it can be to work on that PC. It may block access to legit files or even installers (false positives or unrecognized binaries), it may remove legit program on sight (false positives), it will slow down the system (opening/reading/parsing each and every file you copy, your system uses, or just present in a folder you're opening). Unless you are very experienced (and from your question I'd say you're not), I advise you don't go on that path. Just get a light/common one you can handle. And, as said, get a hardware wallet.

Another direction would be to either ditch Windows for a Linux, or at least install Linux as a secondary OS for when you work with your wallet, but if you're inexperienced you may make mistakes. And I'm back to "get a hardware wallet".

I know it costs some money. I know that it's not the universal solution for everything (if you are overconfident about hardware wallet you can also make mistakes and lose money off it too, but it's much more difficult), but it's an option worth considering. Another good option is to keep completely offline the funds you don't use on a daily basis (a seed stored safely offline in multiple geographically different locations, in the same way you should also store the backup seed for your current wallet).