I run the latest anti-virus software, and my ISP does too. Today however it seems that all my outgoing emails are bouncing back as “banned sender”. As I recall that means someone at my ISP had been spoofed into spamming. I have complained and assume will be fixed by tomorrow.
Microsoft is junk pure and simple. Switch to a Linux. There are many very good out there. If you need a suggestion Red Hat or its child Fedora will do you better. Your ISP is probably running some kind of Linux anyway.