OnLine Anti-Virus

Kaspersky Online Virus Scanner

PC and files scan for malware. Full security status reporting. Cloud-based information about new and emerging threats. Protection against new, emerging and unknown malware. Roll back harmful activity for infected PC. Unlock PC blocked by a Trojan. Alerts for malicious websites & web link reputation. Identity and financial protection against phishing sites or emails. Special Gamer Mode for uninterrupted gaming experience.

Kaspersky.com

McAfee FreeScan Scan Plus

McAfee Security Scan Plus is a free diagnostic tool that ensures you are protected from threats by actively checking your computer for up-to-date anti-virus, firewall, and web security software. It also scans for threats in any open programs.

Mcafee.com

BitDefender QuickScan

Bitdefender QuickScan is an online tool which uses .in-the-cloud. scanning to detect malware running on a PC very fast, usually in less than 60 seconds.
Bitdefender QuickScan uses in-the-cloud scanning technology to detect active malware on your system, in under a minute. Because it focuses on active e-threats, the product uses just a fraction of the system resources needed by a regular virus scan and requires no time-consuming virus signature updates, as the detection process is performed by remote Bitdefender servers.

Bitdefender.com

Trend Micro HouseCall

HouseCall is Trend Micro's highly popular on-demand antivirus software scanner for identifying and removing viruses, trojans, worms, unwanted browser plugins, and other malicious software.
HouseCall can quickly identify and fix a wide range of threats including viruses, worms, Trojans, and spyware. Includes: Full scan and custom scan options, in addition to Quick Scan. Support for 64-bit, Windows 7, Windows 7 SP1, Windows 8, and Windows 8.1. Support for Mac OS 10.7 or later.

Housecall.trendmicro.com

ESET Online Escáner

Detect and remove malware on your PC with a powerful and user-friendly tool that uses the same ThreatSense® scanning technology and signatures as ESET Smart Security and ESET NOD32 Antivirus — just by using your web browser.

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Eset.com
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Panda ActiveScan 2.0

The Panda ActiveScan 2.0 is an advanced online scanner based on Collective Intelligence that detects malware infection that traditional security solutions fail to detect.

Pandasecurity.com 

F-Secure Online Scanner

F-Secure Online Scanner helps to get rid of viruses and spyware that may cause problems on your PC, and all of it for free.

F-secure.com