Windows 10 has a built-in anti-virus named Windows Defender. There are many other tools/applications available.
Attack Surface Analyzer (Microsoft)
Avast!
AVG
AVZ4 Antiviral toolkit
ClamWinPortable
Comodo
Conficker Cleaner
EEK (Emsisoft Emergency Kit)
EMET (Enhanced Mitigation Experience Toolkit)
ERARemover (ESET Rogue Applications Remover)
ESET
Faronics
GFI
HijackFree
HijackThis
HitmanPro
Hosts
MBAM
MultiVirus Cleaner
Panda
RKill
RogueKiller
RogueRemover
SmitFraudFix
SpyBHORemover
Stinger AV
StreamArmor
Symantec
System Cleaner
WinPatrol
XP-AntiSpy