A Trojan is a program that enables an attacker to get nearly complete control over an infected PC. Frequently used tool by malicious hackers. When this program executes, the program performs a specific set of actions. This usually works toward the goal of allowing the trojan to survive on a system and open up a backdoor.
Comment:
Tro.Activate_crack is a trojan downloader used to download and install a number of malware threats. This trojan installs itself through an active X control from crack sites. Troj.Activate_crack takes control of your desktop and changes the background. Troj.Activate_crack then displays ads all over your computer making exploring the internet very difficult. What makes this trojan different from other trojans like it (such as Winfixer, Puper, Vundo, etc...) is that the desktop is altered by an html page, not a hidden window.
Manual
removal:
You'll notice that you are unable to change your desktop from the control panel when you have this trojan. There will be a desktop.html file in the background listbox when trying to change the background. Search your computer for desktop.htm and delete it to get that image off your computer.
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