From intentions like pranks and extortion behind viruses, Spyware evolved with ambitious intentions of tracking user activities, unwanted pop-up advertising to influence user behavior, studying key logs to steal expensive telephone toll dialer, credit card and other financial identity passwords. Beyond privacy infringement, Spyware allows the software writer to use the infected computer resources including memory and bandwidth for more illegal activities. Spyware usually manipulates security holes such as bugs in executables that lead to memory overloads and system crashes. Description of Spyware applications bundled in Shareware End User License Agreements notwithstanding the lack of awareness and understanding of users has limited the control of law over Spyware creators.
Choosing a Spyware detector with rogue software abounding is not so easy. Spyware adware removers are commonly designed for Microsoft OS and browsers which are most vulnerable due to their large user base. Lavasoft distributed Ad-aware and PC Tools distributed Spyware Doctor are the most popular Spyware detectors available in the market. Microsoft acquired GIANT anti-spyware rechristened as Windows Defender is available free of charge to Windows 2000 and XP users. Recognizing the need for Spyware detectors, antivirus leaders Symantec and McAfee have refurbished their products to address Spyware.
As advancement in war led to smaller caliber bullets used by terrorists that fatally wound but do not immediately kill the enemy, likewise malicious software writers are creating sophisticated software that employ deception to make the software appear useful to easily infiltrate any system while allowing it to be remain concealed from the user. Many users avoid the MS Internet Explorer in favour of other browsers to protect their systems from Spyware. Another way of preventing harm from Spyware may be to only download software which is verified by Spyware detectors. Good Spyware removers provide not only removal but also real time protection against Spyware.