Hackers, spyware and adware are already a part of our daily life and you must keep your system malware free. Bu wouldn’t it be nice to try before you buy? Here are the major Free Online Virus Scan options you have :

1. Trend Micro HouseCall
Their online scanner is tightly integrated with Virus Map and it will send back to Trend Micro a few information about your scan such as : the name of the virus, the number of infected files found and the number of files cleaned by HouseCall.
Trend Micro uses this data to analyze worldwide virus trends as they occur and to predict virus outbreaks and prevent them proactively.

2. Panda ActiveScan
Panda ActiveScan is a free online antivirus to combat viruses, spyware and other Internet threats.Its main features are:
Scans, disinfects and eliminates over 185,000 viruses, worms and Trojans from all system devices, hard disks, compressed file and all your email.
Detects spyware. 84 percent of malware installed on computers worldwide is spyware. Do you know if your PC is spyware free?
Detects the following types of malware: Dialers, Hacking tools,Rootkits (New), Jokes, Security risks.

3. Symantec Security Check
Symantec Security Check tests your computer's exposure to a wide range of online threats. It's free and an effective tool that helps determine your Internet security needs.
There are 2 distinct scans you can get for free :
Symantec Security Check
Symantec Security Check tests your computer's exposure to a wide range of online threats. It's free and an effective tool that helps determine your Internet security needs.There are 2 distinct scans you can get for free :

SecurityScan performs the following checks :
Hacker Exposure Check
- Checks whether your computer allows unknown or unauthorized Internet communications.
Windows Vulnerability
Check - Checks whether basic information about your computer, including your PC's network identity, is exposed to hackers.
Trojan Horse Check
- Checks whether your computer is safe from Trojan horses.
Antivirus Product Check
- Checks whether you're protected by a commonly-used virus protection product.
Virus Protection Update Check - Checks whether you're safe from the latest viruses. Applicable if you have a virus protection product.