Antispyunderware.com is a browser hijacker that imitates a system scan and reports false scan results. It displays fake alerts stating that your computer is badly infected and that you should install free removal tool in order to fix found system security threats and remove infections. In short, this is a scam. Such websites as antispyunderware.com are used to promote rogue anti-virus software. In this case it's the rogue anti-spyware application called System Security. Avoid such websites! Also note that Antispyunderware.com displays notifications that read like this one below:
"Warning!!! Your computer contains various signs of viruses and malware programs presence. Your system requires immediate anti viruses check! System Security will perform a quick and free scanning of your PC for viruses and malicious programs."