Regarding Windows Wallet:
Currently Windows wallet is compiled on Qt Framework  (a cross-platform application framework).
People are reporting issue of wallet being deleted by their antivirus after being detected as malware.
This is a FALSE POSITIVE
i.e.  it is a bug in the specific anti-virus software and that there is absolutely nothing that we can do on our side.
REMEDY
Turn Off your Firewall/Antivirus before downloading and installing Windows Wallet.
Add the windows wallet to the Exclusions List of the antivirus.
Turn Back On !! You are good to go.