Well there are scores of antispyware available in the market today. How do you decide which ones the best and what does an antispyware offer? Well you can keep checking this site (http://www.spywatchman.com) for reviews on which ones are the best, for knowing what does an antispyware has to offer in terms of security read on!
First and foremost, an antispyware is suppose to protect your computer and prevent zillions over zillions of spywares and malwares from entering your PC and wreaking a havoc. Well most antispyware applications out there do a fairly OK job doing this, they are not to blame, since new spyware and malware applications are authored and released everyday, day after day. So what exactly is the fuss about?
Spyware and malware applications have created a severe menace. An unsuspecting and innocent web surfer is, from every angle, under a constant and nagging threat from these malicious applications.

There are certain pre-required characteristics that an antispyware should have. These include the detection and deduction characteristics. An ideal antispyware application should be able to make the PC, down right neat and tidy. As described by earlier posts and articles, any software that digs up information from you computer, without your consent and knowledge can be termed as a spyware. Consciously most people won't ever permit spyware into their computers. If there is no antispyware installed, malicious applications mole in into your computer and gathers information and wreaks havoc on your PC.
The antispyware application must have the intelligence to notice and eradicate spyware and adware. On detection, the antispyware should provide detailed information on type of the malware and spyware infection that your computer has; this enables you to make choices, you are provided with a few options. The antispyware should have auto scan and sweep feature that scans and sweeps your computer on a predefined schedule set by you.
One of the most important feature, that every antispyware has, is that the antispyware must not only be able to clean your PC of all infections, but also be able to prevent spyware and other malicious applications from entering into your computer. Since all antispyware have this feature, but the efficiency of the detection algorithm differs from antispyware to antispyware.

The antispyware application should have an excellent user interface, which explains and provides access to all the antispyware applications features with utmost ease. The user interface should not be complicated and congested. The antispyware must run continuously in the background as a process and should protect your computer 24/7, while at the same time should not take too much of your computers memory.
The antispyware application should be flexible and customizable; the customization should be in the scanning and sweeping domains of the antispyware application and you must be able to customize your scans or sweeps for malware and spyware, depending upon locations, time, etc. provided by you.
Last but not the least the anti spyware should be able to provide in depth help and support to you. Most antispyware do provide support, but for some you may have to shell out some extra cash.

These are the basic desirable features that your antispyware application must be able to provide and achieve. The right antispyware will shield you computer the best it can and will be able to prevent further threats from infecting your PC. It will also be able to eliminate the already found threats.