I installed this software from the Personal Computer World November 2007 magazine. This starter edition provides malware protection with no time limit on Windows 2000/XP/Vista. But, the real-time protection is only enabled for File Guard. All other real-time protection for Browser Guard, Network Guard, Process Guard, Startup Guard are disabled. This is definitely not recommended.
It is mentioned online that the paid version US$24.95 offers Cookie Guard, Keylogger Guard and Site Guard in addition to all the above real-time protection. These are not evident in the current software but you do get priority and phone support.
For those who want to try this software without buying the magazine, you can also download a FREE copy of Spyware Doctor Starter Edition as part of the Google Pack.