These Anti-Virus Scanners protect your system in real-time, which can prevent or limit the effects of an virus infection.
Anti-Virus Scanners (Online)
These Anti-Virus Scanners can test if a system is infected or disinfect it after it has been contaminated. These online service are best used when you think you have already been infected.
Malware and Spyware Scanners
These Malware and Spyware Scanners check your system for different types of malware (spyware, keyboard loggers, trojans, etc.).
Kaspersky has a very good online virus scanner that I use. If you receive a file that you think may contain malicious code, you can upload it to have it scanned.
If you are feeling adventurous then you can use these utilities to try and determine exactly what has happened to your system.
- HijackThis (Finds malware by displaying changes to your system)
- ProcessExplorer (Displays processes running on your system)
- AutoRuns (Lists programs that startup automatically)