Cyber Wars!

The major problem for internet users today is to prevent their computer from getting compromised by cyber crooks. There are thousands of computers that are being compromised everyday. Once a system is compromised they have full control it, which enable them to do whatever you do in your computer. Most of the systems are compromised using botnets or worms.
And why do people do this? Money. They see a compromised system as a means to send spam, get users credit card numbers/ their banking details and also use these compromised systems to compromise more systems, all of which generates money. This method has been so lucrative that these people now operate in gangs. Lately there has been strong evidence that these cyber gangs are fighting against each other, to control more systems. For example; a worm and its variants exploit a security hole in the plug-and-play feature in the Windows 2000 operating system. But some other worm comes around a few days later and undoes the effects of earlier worms, suggesting that the creators are battling to take over computers that others have already compromised.

Once your computer is infected it's very hard to clean it up now-a-days. The best and some times the only soultion seems to be "format c:".