ChicaPC-Shield is a free malware scanner that scans your PC for any malware or malicious software. If it finds any infected files, it removes the infection to clean up your computer. It has a very simple to use interface, and can be run anytime. It is especially helpful to protect against infections that come from social networking websites like Facebook, and Twitter.
[advt]It just scans your PC when you ask it to, and remove any detected infections. But it does not prevent your files from getting infected. So, make sure you have a good antivirus also installed and running for proactive protection against viruses. The free version is not real-time in nature. You can run it whenever you want to.