If you are VERY VERY confident in your firewall, anti-virus, anti-malware, and you promise to encrypt your wallet - the Bitcoin Core 0.16.0 wallet works fine on Windows.  Biggest risk is keylogger malware that could capture your pass phrase.  Here is a link to decent "health check" instructions for windows 7: https://answers.microsoft.com/en-us/windows/forum/windows_7-security/how-can-i-remove-keylogger-issues/495a304e-b910-4b8e-8593-834307c590b1?db=5

Remember that you need 187GB of free space to store the full blockchain currently, and that will take a couple of days to download.