ESET/Nod32 Online Scanner
ESET Online Scanner is a user friendly, free and powerful tool that you can use to find and remove both known and unknown viruses, worms, Trojans, spyware, phishing, and other Internet threats from any PC by using your web browser. You don’t need to install antivirus software. The ESET Online Scanner uses the same ThreatSense ® technology and signatures as ESET Smart Security / ESET NOD32 Antivirus, and is always up-to-date.
You'll need administrator privileges to use ESET Online Scanner.
ESET Online scanner Website ESET/Nod32
HouseCall is Trend Micro's highly popular and capable on-demand antivirus software scanner for identifying and removing viruses, trojans, worms, unwanted browser plugins, and other malware software.
It features an intuitive interface and the ability to perform fast scans that target critical system areas and active malware. Full system and custom scan options allows you to specify which folders to scan.
It also leverages the Trend Micro Smart Protection Network™ to help ensure that scans catch the latest threats.
HouseCall Free scanner Website TrendMicro
BitDefender Online Scanner
BitDefender Online Scanner is the next free malware cleaner
to use from within your Web browser. It is an online scanner that
uses BitDefenders scanning engine to detect viruses and spyware on your
PC. From within your browser he scans your memory, boot sectors
and all files and cleans automatically. The big advantage again is you don’t need to install anything and even without having to remove your antivirus software.
BitDefender Online Scanner Website BitDefender
McAfee FreeScan helps you detect thousands of viruses on your computer. Based on the award-winning McAfee VirusScan engine, FreeScan searches for viruses, including the latest known "in the wild" viruses, and displays a detailed list of any infected files. Should viruses be found, FreeScan even provides links to more information about the viruses and what you can do to clean your system. To remove them you could use McAfee Labs Stinger
to detect and removes the most common viruses.
McAfee FreeScan Website McAfee
Panda ActiveScan is the last online scanner I want to mention. It provides the same functionality as the other scanners, but is unable to clean the threats found. You get the advice to install a free (you have to register) or a paid Panda scanner. Because the scan is online the latest virus database is used.
ActiveScan Panda Security website