Why can't I play video on my PC running Windows XP?

Episode 1059 (37:22)

John from Van Nuys, CA
VLC

John has a PC that runs Windows XP and he can't view videos that are sent to him through email. Leo says that it's likely a codec issue. He recommends downloading VLC Media Player. It can play pretty much anything. But the real problem is that after April 8th, Microsoft will stop supporting and updating Windows XP with security patches. So John's computer will be vulnerable to attacks. Leo says that's a cause for worry and John should take it off the Internet before April 8.