Virus ,worms, trojans, rootkits, rogues, dialers, spyware busters

AVG and Malwarebytes

These 2 free for personal use software can save you a lot of cost of computer repairing.
Both can complement each other , working hand in hand to clean viruses and the like.

My experience, even you have Kaspersky Internet Security, Norton, Mcafee antivirus..some malware , trojan , worms , rootkits , etc still cant be cleaned without Malwarebytes anti-malware.But having only Malwarebytes anti malware alone also wont solve the case as some viruses cant be cleaned by itself. It needs some other antivirus programs as well. Thus I recommend Avg free personal edition.
To download Malwarebytes and Avg free editon :

http://malwarebytes.org/products/malwarebytes_free

http://free.avg.com/my-ms/download-avg-anti-virus-free

(Please take note that Malwarebytes free edition do not have real time protection. It means , you need to manually scan your computer when you suspect infection. It wont disinfect , warns automatically upon infection.)