Here is an excellent step by step guide to removing a common malware virus – http://malwaretips.com/blogs/system-care-antivirus-removal/
You will need to download the following tools:
- Malwarebytes Chameleon – http://www.malwarebytes.org/products/chameleon/
- HitmanPro 3 – http://www.surfright.nl/en/hitmanpro/
- Emsisoft Emergency Kit – http://www.emsisoft.com/en/software/eek/
Note: One thing that is not mentioned in the guide above is the restoration of your previous antivirus. This malware/virus will hide your existing systems, and render them unusable. When the virus is removed, you should run a System Restore back to a point before the virus was introduced.