free websites malware scan

I have a personal site-based on Joomla and very concerned about security.

I googled and found http://www.qualys.com/forms/trials/stopmalware/ as free services.

this services can be trusted ?

I need your opinions ;)

A bit more info here abu.

http://news.techworld.com/security/3213885...i-hijack-scans/

Forget it, friend. I will optimize the using of security joomla extension. ;)

anyway,thank for the link hazel :)