Antispyware programs work through a process of "real time" protection. This process is similar to the way antivirus programs work- preventing the programs from entering your system. Through continuously scanning and monitoring all actions of your PC antispyware programs block incoming threats as soon as they arise, so that no infiltration occurs.

If your PC is already infected with spyware, antispyware programs can remove it. You can schedule weekly, monthly or daily scans to monitor whether or not your system is infected. If found, the program will remove the spyware.

Some programs offer both methods of protection discussed above. If you are in the market for an antispyware solution you may want to buy one with real time protection and interval scanning options. Essentially you will be able to protect from spyware and remove spyware that sneaks into your system. It's the best of both worlds.