This is the software publisher's description. 

Complete Internet security suite that blocks and removes viruses, eradicates dangerous spyware, repairs security flaws, detects and stops hijacking programs, and prevents hackers from infiltrating your PC. Consists of these components:

iolo AntiVirus. Detect, block, and remove viruses, rootkits, worms, trojans, and other dangerous programs with always-on protection.

iolo Personal Firewall. Block unwanted communication to and from your PC, keeping your private information safe from hackers and identity thieves.

Spython AntiSpyware. Remove spyware parasites to protect your privacy and prevent system crashes and slow-downs.

Security Optimizer. Repair dangerous security vulnerabilities that would otherwise leave your system open to attacks by intruders and data thieves.

System Guard. Lock down your system configuration to prevent unauthorized changes by spyware, viruses, malicious Web sites, and remote attackers.

Note that the download here is a simple 'stub' that, once downloaded, will obtain the latest files and anti-virus definitions from the Iolo website. Entire download is around 30MB.