Security Toolbar 7.1 is a spyware toolbar and it comes from a very dangerous trojan, called Trojan.Zlob. Once the Security Toolbar 7.1 installed, you start receiving warning messages claming that your system is infected and recommends buying various type of fake & dangerous antispyware application.
Security Toolbar 7.1 may displays warning messages such as, "Critical System Error", "Your computer is infected", "System Alert", "Security Alert", Trojan-Spy.win32@mx", "Virus Alert", "W32.Myzor.fk@yf" or "Spyware.Cyberlog-X".
Not only this, Security Toolbar 7.1 has ability to hijacked your homepage with any obscure website (such as, asafehomepage.com) and so on. Security Toolbar 7.1 also displays blinking icons on your System Tray (It is near of your system clock at the right side of bottom). These Icon generate a fake balloon warning message to download the rogue applications.
If your computer is infected by Security Toolbar 7.1 and hijacked by the unfamiliar webpage then your computer in trouble because it does transfer back and forth information from the infected computer which makes it a potential for application/data theft.
Alias -
Security Toolbar 7.1', hijacker Security Toolbar 7.1', virus Security Toolbar 7.1, homepage hijacker Security Toolbar 7.1, trojan Security Toolbar 7.1
Danger Level - Extremely dangerous Spyware. Security Toolbar 7.1 Uses stealth installation, randomly named entries and has the capability to self update or Restore after incomplete removal. Very hard to remove manually. Removing by free software or Re-Name the Dll file of Security Toolbar 7.1 cannot decrease the Privacy Risk, because it uses stealth installation method.
Systems Affected -
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
Security Toolbar 7.1 Symptoms - Pop up balloon warning messages claiming that your PC is infected. Security Toolbar 7.1's Examples are:
"Critical System Error",
"W32.Myzor.fk@yf"
"Your computer is infected",
"Trojan-Spy.win32@mx",
"Virus Alert",
"Security Alert"
"System Alert" or
"Spyware.Cyberlog-X" infections..
Hijacked homepage to obscure webpage.
Flashing icons appear in the system tray.
Automatic installation of Rogue/Fake antispyware applications such as, SpyDawn, AntiSpyZone, WinAntiVirus, Malware Wipe, SpyHeal, Pest Wipe, PestTrap, BraveSentry Virus Burst, Virus burster, WinAntiSpyware, Virus Blast, SpywareStrike, SpyAxe, SpyTrooper, Adware Punisher, Spy iBlock and SpyGuard.
_______________________________
You can find more information here:
http://www.pcontech.com/Security-Toolbar-remove.htm
Kaspersky Trial antivirus succesfully removes it.
I do not suggest you to return your PC to an earlier state. If the trojan is installed, this will not work .