somebody hacking your computer
Trojan horses can carry viruses. Trojan horses disguise themselves to e something they are not. Trojans can be spread via email.
there are no warning signs
Green signs are not warning signs. They are signs that tell you it is "safe" to do something.
b. Trojan Horses
Trojan Horses are still around and are very common.
its a really sexy horse !
Yup. All are.
computer viruses, worms, Trojan horses, and rootkits
Generic8 Trojan horse is a virus that computers can get. Trojan horses are malicious programs and can be removed with antivirus software.
Homer's Illiad.
malware
It depends on what warning signs that you are interested in. Many sites offer guides on how to spot the warning signs for illnesses etc. If it is to do with motoring check the highway site for details.