ESET NOD32 Online Scanner
A user-friendly, powerful tool, online antivirus utility can remove malware—viruses, spyware, adware, worms, trojans, and more—from any PC utilizing only a web browser. No installation required.

Trend Micro
Go here to double check your current AV protection app.

Avast! (Alwil)

Free Home Edition antimalware progam.


Panda ActiveScan
  • You don't need to install any programs.
  • It scans, disinfects and eliminates viruses from all parts of your system, hard disks, compressed files and all your e-mail.
  • It incorporates a powerful heuristic system.
  • It is updated at least once a day.
Symantec/Norton scan
Free scan from the makers of Norton products. Very reliable, and up to date.

Kaspersky Virus Scanner
This scan installs ActiveX component and can take a good amount of time to download, update and run. Results should be presented to trained analysts to decipher.

BitDefender
BitDefender Online Scanner is an on-demand virus scanner which incorporates the award-winning BitDefender scanning engines. You can use it to scan your system's memory, all files and drives' boot sectors, and to automatically clean infected files.

F-Secure
Free online scan.

McAfee
Free online anti-virus scan.

Microsoft Live One Care
Keep hackers and unwanted software at bay and learn about some quick ways to keep your PC secure. Stats also.

a-Squared
Test your system with the a-squared scanner for Trojans, Backdoors, Worms, Dialers, Spyware/Adware, Keyloggers, Rootkits, Hacking Tools, Riskware and TrackingCookies. Completely free directly from the web browser.

Nanoscan
By Panda this scanner does a quick scan of the system, not too deep tho. Infection map and stats.


Single File Malware Scanners

Jotti Online File Scanner
This site offers a free scan of single files. Its a great little site we use alot in malware situations.
By uploading files to this online service you agree that your files will be stored locally for personal virus collection interests.

Virus Total
Single file scanner

avast! Online Scanner
Single file scanner

Kaspersky File Checker
Single file scanner.

Pest Patrol
Free malware scan here along with privacy and optimization.

Spyware-Guide Online ActiveX Scan
Scans your computer for known malware AcitveX installs. Data base limited.

Norman Sandbox
Another excellent online file scanner, always current and accurate.

Online Virus Scanner
If you discover a suspicious file on your machine, or suspect that a program you downloaded from the internet might be malicious you can scan it here. Enter the file name to be checked in the box below and it will automatically be uploaded from your computer to a dedicated server where it will be scanned using FortiClient Anti-Virus. Updates every three hours are performed to ensure that even the newest viruses can be detected. Only one file of up to 1 MB can be checked at any one time.


Single File Analysis

Sunbelt CWSandbox
Submit files for detailed analysis to monitor Windows changes

ANUBIS File Analysis
Anubis is a service for analyzing malware. Submit your Windows executable and receive an analysis report telling you what it does.

Sophos File Analysis
Submission form for analysis.


Browser Scans

ShieldsUp!
Multiple levels of security available here, several tests, port scans, and lots of others, too many to list, check it out!

Scanit Browser Security Test
Scan it's Browser Security Test automatically checks your browser for various security problems. When the test is finished you get a complete report explaining the discovered vulnerabilities, their impact and how to eliminate them.

AuditMyPC
Security and spyware site, checks for all sorts of vulnerabilities. Two separate tests here, very helpful.

Browser Spy
BrowserSpy can tell you all kinds of detailed information about you and your browser. Stuff like the version of your browser. What kind of things it supports and what it doesn't support. Furthermore it can provide you detailed information about Javascript, Java, Plug-ins, Components, Bandwidth, Language, Screen, Hardware, IP, Cookies, Web Server, and much more.

PC Pitstop
Automated tests will get your PC running fast, stable and secure for free. The diagnostic tests are safe, passive evaluations of your system, and the advice will help you locate and fix system problems. Whether you are a guru or a novice, our tests can quickly determine your PC's operating status. Excellent site!

Dr. Web Browser File\Site Scanner Plugin
For users surfing the World Wide Web with Mozilla, Mozilla Firefox, MS Internet Explorer or Opera Doctor Web offers free plugins which enable you to scan for viruses and all kinds of malicious programs any web link before it is opened, or any file before it is downloaded onto your computer. When a page is scanned, the URLs it contains pointing at scripts and frames are checked as well.


Software and System Security Scans

Secunia Software Inspector
This scan will determine if you have any software that needs updating.


GFI Event Log Scanner