As you are using an outdated OS, your system is vulnerable and might be a soft target for cybercriminals to attack. So I think you have to use some on demand scanners too along-with your antivirus. Zemena Antimalare, Malwarebyte,Hitman pro and Emsisoft emergency kit are the well known on demand scanner.
Also use some extensions like HTTPS Everywhere, Disconect and WOT.
Except Tanscent, use QIhoo Total security which has Avira and Bitdefender engine. It is very lighter and powerful too..Well other than chinese antivirus you can use Avast or AVG or Panda free as a free antivirus. If you want to use paid then go for Eset or kaspersky
Better way move from xp to Windows 7 or + versions.