Anything which promises to speed up your PC should be avoided. Anything which promises to speed up your PC by cleaning the registry should most definitely be avoided.
Use just one anti-virus solution..
You can get Bitdefender free here. http://www.bitdefender.com/solutions/free.html
or Microsoft Security Essentials from here.. http://www.microsoft.com/security/pc-security/mse.aspx
Alongside, you should have Malwarebytes..
When installing it, ensure that you don't check the box to install the trial PRO version. This will not only stop it real-time monitoring and thereby interfering in the normal operation of your primary a-v solution, it will also not prompt you to buy the full version at the end of the PRO trial period.
How to use Malwarebytes
http://www.bleepingcomputer.com/virus-removal/how-to-use-malwarebytes-anti-malware-tutorial